131555412 has 18 divisors (see below), whose sum is σ = 332542938. Its totient is φ = 43851792.

The previous prime is 131555383. The next prime is 131555443. The reversal of 131555412 is 214555131.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 2414916 = 11364^2 + 1554^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1827123 + ... + 1827194.

Almost surely, 2^131555412 is an apocalyptic number.

131555412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131555412 is an abundant number, since it is smaller than the sum of its proper divisors (200987526).

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

131555412 is a wasteful number, since it uses less digits than its factorization.

131555412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654327 (or 3654322 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 131555412 is about 11469.7607647239. The cubic root of 131555412 is about 508.5920567288.

The spelling of 131555412 in words is "one hundred thirty-one million, five hundred fifty-five thousand, four hundred twelve".