158731857 has 12 divisors (see below), whose sum is σ = 232421124. Its totient is φ = 104371200.

The previous prime is 158731847. The next prime is 158731861. The reversal of 158731857 is 758137851.

158731857 is a `hidden beast` number, since 1 + 587 + 3 + 18 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 80568576 + 78163281 = 8976^2 + 8841^2 .

It is not a de Polignac number, because 158731857 - 2⁴ = 158731841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158731847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120144 + ... + 121457.

It is an arithmetic number, because the mean of its divisors is an integer number (19368427).

Almost surely, 2^158731857 is an apocalyptic number.

It is an amenable number.

158731857 is a deficient number, since it is larger than the sum of its proper divisors (73689267).

158731857 is a wasteful number, since it uses less digits than its factorization.

158731857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241680 (or 241677 counting only the distinct ones).

The product of its digits is 235200, while the sum is 45.

The square root of 158731857 is about 12598.8831647889. The cubic root of 158731857 is about 541.4454381890.

The spelling of 158731857 in words is "one hundred fifty-eight million, seven hundred thirty-one thousand, eight hundred fifty-seven".