131581904220 has 192 divisors, whose sum is σ = 464059008000. Its totient is φ = 30684655872.

The previous prime is 131581904219. The next prime is 131581904243. The reversal of 131581904220 is 22409185131.

131581904220 is a `hidden beast` number, since 1 + 31 + 581 + 9 + 0 + 42 + 2 + 0 = 666.

It is a super-2 number, since 2×131581904220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 359880 + ... + 626639.

It is an arithmetic number, because the mean of its divisors is an integer number (2416974000).

Almost surely, 2^131581904220 is an apocalyptic number.

131581904220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131581904220 is an abundant number, since it is smaller than the sum of its proper divisors (332477103780).

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

131581904220 is a wasteful number, since it uses less digits than its factorization.

131581904220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986569 (or 986561 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 131581904220 in words is "one hundred thirty-one billion, five hundred eighty-one million, nine hundred four thousand, two hundred twenty".