131212573956 has 72 divisors (see below), whose sum is σ = 345905391104. Its totient is φ = 41890245120.

The previous prime is 131212573949. The next prime is 131212573967. The reversal of 131212573956 is 659375212131.

131212573956 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 1 + 257 + 395 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497800 + ... + 714303.

Almost surely, 2^131212573956 is an apocalyptic number.

It is an amenable number.

131212573956 is an abundant number, since it is smaller than the sum of its proper divisors (214692817148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131212573956 is a wasteful number, since it uses less digits than its factorization.

131212573956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212241 (or 1212236 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The spelling of 131212573956 in words is "one hundred thirty-one billion, two hundred twelve million, five hundred seventy-three thousand, nine hundred fifty-six".