Base | Representation |
---|---|
bin | 1010011000110… |
… | …10000001111111 |
3 | 20001222002110022 |
4 | 11030122001333 |
5 | 134301412211 |
6 | 12351402355 |
7 | 2105443622 |
oct | 514320177 |
9 | 201862408 |
10 | 87138431 |
11 | 45207436 |
12 | 252233bb |
13 | 1508c603 |
14 | b803db9 |
15 | 79b3bdb |
hex | 531a07f |
87138431 has 2 divisors, whose sum is σ = 87138432. Its totient is φ = 87138430.
The previous prime is 87138377. The next prime is 87138433. The reversal of 87138431 is 13483178.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-87138431 is a prime.
It is a super-2 number, since 2×871384312 = 15186212314283522, which contains 22 as substring.
Together with 87138433, it forms a pair of twin primes.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 87138391 and 87138400.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (87138433) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43569215 + 43569216.
It is an arithmetic number, because the mean of its divisors is an integer number (43569216).
Almost surely, 287138431 is an apocalyptic number.
87138431 is a deficient number, since it is larger than the sum of its proper divisors (1).
87138431 is an equidigital number, since it uses as much as digits as its factorization.
87138431 is an evil number, because the sum of its binary digits is even.
The product of its digits is 16128, while the sum is 35.
The square root of 87138431 is about 9334.7967840762. The cubic root of 87138431 is about 443.3396546231.
The spelling of 87138431 in words is "eighty-seven million, one hundred thirty-eight thousand, four hundred thirty-one".
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