5631918 has 32 divisors (see below), whose sum is σ = 12082176. Its totient is φ = 1745568.

The previous prime is 5631911. The next prime is 5631943. The reversal of 5631918 is 8191365.

5631918 = 372² + 373² + ... + 408².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4555 + ... + 5657.

It is an arithmetic number, because the mean of its divisors is an integer number (377568).

Almost surely, 2^5631918 is an apocalyptic number.

5631918 is an abundant number, since it is smaller than the sum of its proper divisors (6450258).

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

5631918 is a wasteful number, since it uses less digits than its factorization.

5631918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its digits is 6480, while the sum is 33.

The square root of 5631918 is about 2373.1662394363. The cubic root of 5631918 is about 177.9175437642.

The spelling of 5631918 in words is "five million, six hundred thirty-one thousand, nine hundred eighteen".