11815957 has 2 divisors, whose sum is σ = 11815958. Its totient is φ = 11815956.

The previous prime is 11815949. The next prime is 11815961. The reversal of 11815957 is 75951811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11229201 + 586756 = 3351^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 11815957 - 2³ = 11815949 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 (11815157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907978 + 5907979.

It is an arithmetic number, because the mean of its divisors is an integer number (5907979).

Almost surely, 2^11815957 is an apocalyptic number.

It is an amenable number.

11815957 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815957 is an equidigital number, since it uses as much as digits as its factorization.

11815957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 37.

The square root of 11815957 is about 3437.4346539243. The cubic root of 11815957 is about 227.7663876297.

The spelling of 11815957 in words is "eleven million, eight hundred fifteen thousand, nine hundred fifty-seven".