131231071 has 2 divisors, whose sum is σ = 131231072. Its totient is φ = 131231070.

The previous prime is 131231063. The next prime is 131231131. The reversal of 131231071 is 170132131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131231071 - 2³ = 131231063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131231371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65615535 + 65615536.

It is an arithmetic number, because the mean of its divisors is an integer number (65615536).

Almost surely, 2^131231071 is an apocalyptic number.

131231071 is a deficient number, since it is larger than the sum of its proper divisors (1).

131231071 is an equidigital number, since it uses as much as digits as its factorization.

131231071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 131231071 is about 11455.6130783123. The cubic root of 131231071 is about 508.1737462911.

The spelling of 131231071 in words is "one hundred thirty-one million, two hundred thirty-one thousand, seventy-one".