158989631 has 2 divisors, whose sum is σ = 158989632. Its totient is φ = 158989630.

The previous prime is 158989613. The next prime is 158989637. The reversal of 158989631 is 136989851.

It is a happy number.

Together with previous prime (158989613) 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 a de Polignac number, because none of the positive numbers 2^k-158989631 is a prime.

It is a super-2 number, since 2×158989631² = 50555405531032322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 158989631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158989637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79494815 + 79494816.

It is an arithmetic number, because the mean of its divisors is an integer number (79494816).

Almost surely, 2^158989631 is an apocalyptic number.

158989631 is a deficient number, since it is larger than the sum of its proper divisors (1).

158989631 is an equidigital number, since it uses as much as digits as its factorization.

158989631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 158989631 is about 12609.1090486204. The cubic root of 158989631 is about 541.7383747064.

The spelling of 158989631 in words is "one hundred fifty-eight million, nine hundred eighty-nine thousand, six hundred thirty-one".