157311031 has 4 divisors (see below), whose sum is σ = 157620600. Its totient is φ = 157001464.

The previous prime is 157311023. The next prime is 157311043. The reversal of 157311031 is 130113751.

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 157311031 - 2³ = 157311023 is a prime.

It is a super-2 number, since 2×157311031² = 49493520948565922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157310993 and 157311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157311061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154021 + ... + 155038.

It is an arithmetic number, because the mean of its divisors is an integer number (39405150).

Almost surely, 2^157311031 is an apocalyptic number.

157311031 is a deficient number, since it is larger than the sum of its proper divisors (309569).

157311031 is an equidigital number, since it uses as much as digits as its factorization.

157311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309568.

The product of its (nonzero) digits is 315, while the sum is 22.

The square root of 157311031 is about 12542.3694332451. The cubic root of 157311031 is about 539.8250816634.

Adding to 157311031 its reverse (130113751), we get a palindrome (287424782).

The spelling of 157311031 in words is "one hundred fifty-seven million, three hundred eleven thousand, thirty-one".