135125631 has 8 divisors (see below), whose sum is σ = 200186160. Its totient is φ = 90083736.

The previous prime is 135125623. The next prime is 135125633. The reversal of 135125631 is 136521531.

135125631 is a `hidden beast` number, since 1 + 3 + 5 + 1 + 25 + 631 = 666.

It is not a de Polignac number, because 135125631 - 2³ = 135125623 is a prime.

It is a super-2 number, since 2×135125631² = 36517872306296322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5004653 = 135125631 / (1 + 3 + 5 + 1 + 2 + 5 + 6 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 135125595 and 135125604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135125633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2502300 + ... + 2502353.

It is an arithmetic number, because the mean of its divisors is an integer number (25023270).

Almost surely, 2^135125631 is an apocalyptic number.

135125631 is a deficient number, since it is larger than the sum of its proper divisors (65060529).

135125631 is an equidigital number, since it uses as much as digits as its factorization.

135125631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5004662 (or 5004656 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 135125631 is about 11624.3550788850. The cubic root of 135125631 is about 513.1518650279.

The spelling of 135125631 in words is "one hundred thirty-five million, one hundred twenty-five thousand, six hundred thirty-one".