131217956 has 6 divisors (see below), whose sum is σ = 229631430. Its totient is φ = 65608976.

The previous prime is 131217949. The next prime is 131217979. The reversal of 131217956 is 659712131.

It can be written as a sum of positive squares in only one way, i.e., 122456356 + 8761600 = 11066^2 + 2960^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16402241 + ... + 16402248.

It is an arithmetic number, because the mean of its divisors is an integer number (38271905).

Almost surely, 2^131217956 is an apocalyptic number.

It is an amenable number.

131217956 is a deficient number, since it is larger than the sum of its proper divisors (98413474).

131217956 is a wasteful number, since it uses less digits than its factorization.

131217956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32804493 (or 32804491 counting only the distinct ones).

The product of its digits is 11340, while the sum is 35.

The square root of 131217956 is about 11455.0406372042. The cubic root of 131217956 is about 508.1568170668.

The spelling of 131217956 in words is "one hundred thirty-one million, two hundred seventeen thousand, nine hundred fifty-six".