158695631 has 2 divisors, whose sum is σ = 158695632. Its totient is φ = 158695630.

The previous prime is 158695613. The next prime is 158695639. The reversal of 158695631 is 136596851.

158695631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (158695613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158695631 - 2¹⁴ = 158679247 is a prime.

It is a super-2 number, since 2×158695631² = 50368606596976322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158695639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79347815 + 79347816.

It is an arithmetic number, because the mean of its divisors is an integer number (79347816).

Almost surely, 2^158695631 is an apocalyptic number.

158695631 is a deficient number, since it is larger than the sum of its proper divisors (1).

158695631 is an equidigital number, since it uses as much as digits as its factorization.

158695631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 158695631 is about 12597.4454156388. The cubic root of 158695631 is about 541.4042452507.

The spelling of 158695631 in words is "one hundred fifty-eight million, six hundred ninety-five thousand, six hundred thirty-one".