655633631 has 4 divisors (see below), whose sum is σ = 655832064. Its totient is φ = 655435200.

The previous prime is 655633613. The next prime is 655633633. The reversal of 655633631 is 136336556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655633631 - 2⁶ = 655633567 is a prime.

It is a super-2 number, since 2×655633631² = 859710916196488322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655633633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94175 + ... + 100896.

It is an arithmetic number, because the mean of its divisors is an integer number (163958016).

Almost surely, 2^655633631 is an apocalyptic number.

655633631 is a deficient number, since it is larger than the sum of its proper divisors (198433).

655633631 is a wasteful number, since it uses less digits than its factorization.

655633631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198432.

The product of its digits is 145800, while the sum is 38.

The square root of 655633631 is about 25605.3437977310. The cubic root of 655633631 is about 868.7345105946.

The spelling of 655633631 in words is "six hundred fifty-five million, six hundred thirty-three thousand, six hundred thirty-one".