158657531 has 2 divisors, whose sum is σ = 158657532. Its totient is φ = 158657530.

The previous prime is 158657491. The next prime is 158657557. The reversal of 158657531 is 135756851.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158657531 is a prime.

It is a super-2 number, since 2×158657531² = 50344424286031922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158657131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79328765 + 79328766.

It is an arithmetic number, because the mean of its divisors is an integer number (79328766).

Almost surely, 2^158657531 is an apocalyptic number.

158657531 is a deficient number, since it is larger than the sum of its proper divisors (1).

158657531 is an equidigital number, since it uses as much as digits as its factorization.

158657531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 41.

The square root of 158657531 is about 12595.9331135093. The cubic root of 158657531 is about 541.3609146045.

The spelling of 158657531 in words is "one hundred fifty-eight million, six hundred fifty-seven thousand, five hundred thirty-one".