131721228756 has 48 divisors (see below), whose sum is σ = 367768676800. Its totient is φ = 40529608416.

The previous prime is 131721228719. The next prime is 131721228787. The reversal of 131721228756 is 657822127131.

131721228756 is a `hidden beast` number, since 1 + 317 + 2 + 1 + 2 + 287 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46907866 + ... + 46910673.

Almost surely, 2^131721228756 is an apocalyptic number.

It is an amenable number.

131721228756 is an abundant number, since it is smaller than the sum of its proper divisors (236047448044).

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

131721228756 is a wasteful number, since it uses less digits than its factorization.

131721228756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93818565 (or 93818557 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 131721228756 in words is "one hundred thirty-one billion, seven hundred twenty-one million, two hundred twenty-eight thousand, seven hundred fifty-six".