158957681 has 2 divisors, whose sum is σ = 158957682. Its totient is φ = 158957680.

The previous prime is 158957663. The next prime is 158957693. The reversal of 158957681 is 186759851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158357056 + 600625 = 12584^2 + 775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158957681 is a prime.

It is a super-2 number, since 2×158957681² = 50535088697795522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (158957651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79478840 + 79478841.

It is an arithmetic number, because the mean of its divisors is an integer number (79478841).

Almost surely, 2^158957681 is an apocalyptic number.

It is an amenable number.

158957681 is a deficient number, since it is larger than the sum of its proper divisors (1).

158957681 is an equidigital number, since it uses as much as digits as its factorization.

158957681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 50.

The square root of 158957681 is about 12607.8420437440. The cubic root of 158957681 is about 541.7020836592.

The spelling of 158957681 in words is "one hundred fifty-eight million, nine hundred fifty-seven thousand, six hundred eighty-one".