131191912 has 8 divisors (see below), whose sum is σ = 245984850. Its totient is φ = 65595952.

The previous prime is 131191901. The next prime is 131191937. The reversal of 131191912 is 219191131.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 3818116 = 11286^2 + 1954^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×131191912² = 34422635548431488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199487 + ... + 8199502.

Almost surely, 2^131191912 is an apocalyptic number.

It is an amenable number.

131191912 is a deficient number, since it is larger than the sum of its proper divisors (114792938).

131191912 is a wasteful number, since it uses less digits than its factorization.

131191912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16398995 (or 16398991 counting only the distinct ones).

The product of its digits is 486, while the sum is 28.

The square root of 131191912 is about 11453.9037886652. The cubic root of 131191912 is about 508.1231953679.

The spelling of 131191912 in words is "one hundred thirty-one million, one hundred ninety-one thousand, nine hundred twelve".