11957131 has 2 divisors, whose sum is σ = 11957132. Its totient is φ = 11957130.

The previous prime is 11957123. The next prime is 11957147. The reversal of 11957131 is 13175911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11957131 - 2³ = 11957123 is a prime.

It is a super-2 number, since 2×11957131² = 285945963502322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11957131.

It is not a weakly prime, because it can be changed into another prime (11957111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5978565 + 5978566.

It is an arithmetic number, because the mean of its divisors is an integer number (5978566).

Almost surely, 2^11957131 is an apocalyptic number.

11957131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11957131 is an equidigital number, since it uses as much as digits as its factorization.

11957131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945, while the sum is 28.

The square root of 11957131 is about 3457.9084718945. The cubic root of 11957131 is about 228.6698968039.

The spelling of 11957131 in words is "eleven million, nine hundred fifty-seven thousand, one hundred thirty-one".