131555331 has 12 divisors (see below), whose sum is σ = 198286608. Its totient is φ = 83890224.

The previous prime is 131555327. The next prime is 131555341. The reversal of 131555331 is 133555131.

It is not a de Polignac number, because 131555331 - 2² = 131555327 is a prime.

It is a super-2 number, since 2×131555331² = 34613610229039122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131555295 and 131555304.

It is not an unprimeable number, because it can be changed into a prime (131555321) 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 11 ways as a sum of consecutive naturals, for example, 317560 + ... + 317973.

It is an arithmetic number, because the mean of its divisors is an integer number (16523884).

Almost surely, 2^131555331 is an apocalyptic number.

131555331 is a deficient number, since it is larger than the sum of its proper divisors (66731277).

131555331 is a wasteful number, since it uses less digits than its factorization.

131555331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635562 (or 635559 counting only the distinct ones).

The product of its digits is 3375, while the sum is 27.

The square root of 131555331 is about 11469.7572336994. The cubic root of 131555331 is about 508.5919523470.

The spelling of 131555331 in words is "one hundred thirty-one million, five hundred fifty-five thousand, three hundred thirty-one".