131220912 has 40 divisors (see below), whose sum is σ = 340732656. Its totient is φ = 43515136.

The previous prime is 131220899. The next prime is 131220913. The reversal of 131220912 is 219022131.

It is a super-2 number, since 2×131220912² = 34437855492223488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131220913) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 2518 + ... + 16394.

Almost surely, 2^131220912 is an apocalyptic number.

131220912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131220912 is an abundant number, since it is smaller than the sum of its proper divisors (209511744).

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

131220912 is a wasteful number, since it uses less digits than its factorization.

131220912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14085 (or 14079 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 131220912 is about 11455.1696626458. The cubic root of 131220912 is about 508.1606328562.

The spelling of 131220912 in words is "one hundred thirty-one million, two hundred twenty thousand, nine hundred twelve".