131555025 has 72 divisors (see below), whose sum is σ = 272286144. Its totient is φ = 59472000.

The previous prime is 131555023. The next prime is 131555029. The reversal of 131555025 is 520555131.

131555025 is a `hidden beast` number, since 1 + 3 + 155 + 502 + 5 = 666.

It is not a de Polignac number, because 131555025 - 2¹ = 131555023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131555025.

It is not an unprimeable number, because it can be changed into a prime (131555023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 158662 + ... + 159488.

It is an arithmetic number, because the mean of its divisors is an integer number (3781752).

Almost surely, 2^131555025 is an apocalyptic number.

131555025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131555025 is an abundant number, since it is smaller than the sum of its proper divisors (140731119).

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

131555025 is a wasteful number, since it uses less digits than its factorization.

131555025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 131555025 is about 11469.7438942637. The cubic root of 131555025 is about 508.5915580154.

The spelling of 131555025 in words is "one hundred thirty-one million, five hundred fifty-five thousand, twenty-five".