157881613 has 2 divisors, whose sum is σ = 157881614. Its totient is φ = 157881612.

The previous prime is 157881589. The next prime is 157881617. The reversal of 157881613 is 316188751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154206724 + 3674889 = 12418^2 + 1917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157881613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157881617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78940806 + 78940807.

It is an arithmetic number, because the mean of its divisors is an integer number (78940807).

Almost surely, 2^157881613 is an apocalyptic number.

It is an amenable number.

157881613 is a deficient number, since it is larger than the sum of its proper divisors (1).

157881613 is an equidigital number, since it uses as much as digits as its factorization.

157881613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 157881613 is about 12565.0950255062. The cubic root of 157881613 is about 540.4769597128.

The spelling of 157881613 in words is "one hundred fifty-seven million, eight hundred eighty-one thousand, six hundred thirteen".