157331491 has 2 divisors, whose sum is σ = 157331492. Its totient is φ = 157331490.

The previous prime is 157331443. The next prime is 157331519. The reversal of 157331491 is 194133751.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157331491 - 2¹⁵ = 157298723 is a prime.

It is not a weakly prime, because it can be changed into another prime (157331411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78665745 + 78665746.

It is an arithmetic number, because the mean of its divisors is an integer number (78665746).

Almost surely, 2^157331491 is an apocalyptic number.

157331491 is a deficient number, since it is larger than the sum of its proper divisors (1).

157331491 is an equidigital number, since it uses as much as digits as its factorization.

157331491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 157331491 is about 12543.1850420856. The cubic root of 157331491 is about 539.8484840112.

The spelling of 157331491 in words is "one hundred fifty-seven million, three hundred thirty-one thousand, four hundred ninety-one".