157215631 has 2 divisors, whose sum is σ = 157215632. Its totient is φ = 157215630.

The previous prime is 157215559. The next prime is 157215661. The reversal of 157215631 is 136512751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157215631 - 2¹⁵ = 157182863 is a prime.

It is a super-2 number, since 2×157215631² = 49433509261456322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 157215593 and 157215602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157215661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78607815 + 78607816.

It is an arithmetic number, because the mean of its divisors is an integer number (78607816).

Almost surely, 2^157215631 is an apocalyptic number.

157215631 is a deficient number, since it is larger than the sum of its proper divisors (1).

157215631 is an equidigital number, since it uses as much as digits as its factorization.

157215631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300, while the sum is 31.

The square root of 157215631 is about 12538.5657473253. The cubic root of 157215631 is about 539.7159354147.

The spelling of 157215631 in words is "one hundred fifty-seven million, two hundred fifteen thousand, six hundred thirty-one".