157797031 has 4 divisors (see below), whose sum is σ = 180339472. Its totient is φ = 135254592.

The previous prime is 157797023. The next prime is 157797041. The reversal of 157797031 is 130797751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157797031 - 2³ = 157797023 is a prime.

It is a super-2 number, since 2×157797031² = 49799805984829922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157797041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11271210 + ... + 11271223.

It is an arithmetic number, because the mean of its divisors is an integer number (45084868).

Almost surely, 2^157797031 is an apocalyptic number.

157797031 is a deficient number, since it is larger than the sum of its proper divisors (22542441).

157797031 is an equidigital number, since it uses as much as digits as its factorization.

157797031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22542440.

The product of its (nonzero) digits is 46305, while the sum is 40.

The square root of 157797031 is about 12561.7288221009. The cubic root of 157797031 is about 540.3804258029.

The spelling of 157797031 in words is "one hundred fifty-seven million, seven hundred ninety-seven thousand, thirty-one".