131319731 has 2 divisors, whose sum is σ = 131319732. Its totient is φ = 131319730.

The previous prime is 131319707. The next prime is 131319779. The reversal of 131319731 is 137913131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131319731 is a prime.

It is a super-2 number, since 2×131319731² = 34489743499824722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131319694 and 131319703.

It is not a weakly prime, because it can be changed into another prime (131319701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65659865 + 65659866.

It is an arithmetic number, because the mean of its divisors is an integer number (65659866).

Almost surely, 2^131319731 is an apocalyptic number.

131319731 is a deficient number, since it is larger than the sum of its proper divisors (1).

131319731 is an equidigital number, since it uses as much as digits as its factorization.

131319731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701, while the sum is 29.

The square root of 131319731 is about 11459.4821436224. The cubic root of 131319731 is about 508.2881616285.

The spelling of 131319731 in words is "one hundred thirty-one million, three hundred nineteen thousand, seven hundred thirty-one".