131331731 has 2 divisors, whose sum is σ = 131331732. Its totient is φ = 131331730.

The previous prime is 131331727. The next prime is 131331737. The reversal of 131331731 is 137133131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131331731 - 2² = 131331727 is a prime.

It is a super-2 number, since 2×131331731² = 34496047134912722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131331697 and 131331706.

It is not a weakly prime, because it can be changed into another prime (131331737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65665865 + 65665866.

It is an arithmetic number, because the mean of its divisors is an integer number (65665866).

Almost surely, 2^131331731 is an apocalyptic number.

131331731 is a deficient number, since it is larger than the sum of its proper divisors (1).

131331731 is an equidigital number, since it uses as much as digits as its factorization.

131331731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 23.

The square root of 131331731 is about 11460.0057155309. The cubic root of 131331731 is about 508.3036436182.

Adding to 131331731 its reverse (137133131), we get a palindrome (268464862).

The spelling of 131331731 in words is "one hundred thirty-one million, three hundred thirty-one thousand, seven hundred thirty-one".