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120130031 = 717161433
BaseRepresentation
bin1110010100100…
…00100111101111
322101001020102102
413022100213233
5221223130111
615530445315
72656042220
oct712204757
9271036372
10120130031
11618a051a
123429383b
131bb71178
1411d51247
15a82e13b
hex72909ef

120130031 has 4 divisors (see below), whose sum is σ = 137291472. Its totient is φ = 102968592.

The previous prime is 120130019. The next prime is 120130039. The reversal of 120130031 is 130031021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130031021 = 1131150717.

It is a cyclic number.

It is not a de Polignac number, because 120130031 - 222 = 115935727 is a prime.

It is a super-2 number, since 2×1201300312 = 28862448696121922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120129994 and 120130021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120130039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8580710 + ... + 8580723.

It is an arithmetic number, because the mean of its divisors is an integer number (34322868).

Almost surely, 2120130031 is an apocalyptic number.

120130031 is a deficient number, since it is larger than the sum of its proper divisors (17161441).

120130031 is an equidigital number, since it uses as much as digits as its factorization.

120130031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17161440.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 120130031 is about 10960.3846191637. The cubic root of 120130031 is about 493.4205083448.

Adding to 120130031 its reverse (130031021), we get a palindrome (250161052).

The spelling of 120130031 in words is "one hundred twenty million, one hundred thirty thousand, thirty-one".

Divisors: 1 7 17161433 120130031