131999957 has 2 divisors, whose sum is σ = 131999958. Its totient is φ = 131999956.

The previous prime is 131999887. The next prime is 131999969. The reversal of 131999957 is 759999131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123854641 + 8145316 = 11129^2 + 2854^2 .

It is a cyclic number.

It is not a de Polignac number, because 131999957 - 2¹⁴ = 131983573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131999899 and 131999908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131999557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65999978 + 65999979.

It is an arithmetic number, because the mean of its divisors is an integer number (65999979).

Almost surely, 2^131999957 is an apocalyptic number.

It is an amenable number.

131999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

131999957 is an equidigital number, since it uses as much as digits as its factorization.

131999957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688905, while the sum is 53.

The square root of 131999957 is about 11489.1234217411. The cubic root of 131999957 is about 509.1642816779.

The spelling of 131999957 in words is "one hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred fifty-seven".