| Base | Representation |
|---|---|
| bin | 10010101001001… |
| … | …11110101111101 |
| 3 | 101220021222212102 |
| 4 | 21110213311331 |
| 5 | 310014313041 |
| 6 | 23304114445 |
| 7 | 3606246440 |
| oct | 1124476575 |
| 9 | 356258772 |
| 10 | 156401021 |
| 11 | 80314447 |
| 12 | 44465a25 |
| 13 | 265305aa |
| 14 | 16ab3657 |
| 15 | dae609b |
| hex | 9527d7d |
156401021 has 4 divisors (see below), whose sum is σ = 178744032. Its totient is φ = 134058012.
The previous prime is 156400999. The next prime is 156401023. The reversal of 156401021 is 120104651.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120104651 = 3637 ⋅33023.
It is a cyclic number.
It is not a de Polignac number, because 156401021 - 226 = 89292157 is a prime.
It is a super-2 number, since 2×1564010212 = 48922558739684882, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 156400984 and 156401002.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (156401023) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11171495 + ... + 11171508.
It is an arithmetic number, because the mean of its divisors is an integer number (44686008).
Almost surely, 2156401021 is an apocalyptic number.
It is an amenable number.
156401021 is a deficient number, since it is larger than the sum of its proper divisors (22343011).
156401021 is an equidigital number, since it uses as much as digits as its factorization.
156401021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 22343010.
The product of its (nonzero) digits is 240, while the sum is 20.
The square root of 156401021 is about 12506.0393810351. The cubic root of 156401021 is about 538.7821445678.
Adding to 156401021 its reverse (120104651), we get a palindrome (276505672).
It can be divided in two parts, 15640 and 1021, that added together give a palindrome (16661).
The spelling of 156401021 in words is "one hundred fifty-six million, four hundred one thousand, twenty-one".
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