158731 has 2 divisors, whose sum is σ = 158732. Its totient is φ = 158730.

The previous prime is 158699. The next prime is 158747. The reversal of 158731 is 137851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158731 - 2⁵ = 158699 is a prime.

It is a super-2 number, since 2×158731² = 50391060722, which contains 22 as substring.

It is equal to p₁₄₅₇₈ and since 158731 and 14578 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 158696 and 158705.

It is not a weakly prime, because it can be changed into another prime (158761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79365 + 79366.

It is an arithmetic number, because the mean of its divisors is an integer number (79366).

2¹⁵⁸⁷³¹ is an apocalyptic number.

158731 is a deficient number, since it is larger than the sum of its proper divisors (1).

158731 is an equidigital number, since it uses as much as digits as its factorization.

158731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 158731 is about 398.4105922287. The cubic root of 158731 is about 54.1444463758.

The spelling of 158731 in words is "one hundred fifty-eight thousand, seven hundred thirty-one".