131567731 has 2 divisors, whose sum is σ = 131567732. Its totient is φ = 131567730.

The previous prime is 131567717. The next prime is 131567741. The reversal of 131567731 is 137765131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131567731 - 2⁷ = 131567603 is a prime.

It is a super-2 number, since 2×131567731² = 34620135680976722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131567701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65783865 + 65783866.

It is an arithmetic number, because the mean of its divisors is an integer number (65783866).

Almost surely, 2^131567731 is an apocalyptic number.

131567731 is a deficient number, since it is larger than the sum of its proper divisors (1).

131567731 is an equidigital number, since it uses as much as digits as its factorization.

131567731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 34.

The square root of 131567731 is about 11470.2977729438. The cubic root of 131567731 is about 508.6079312815.

The spelling of 131567731 in words is "one hundred thirty-one million, five hundred sixty-seven thousand, seven hundred thirty-one".