626631 has 4 divisors (see below), whose sum is σ = 835512. Its totient is φ = 417752.

The previous prime is 626629. The next prime is 626663. The reversal of 626631 is 136626.

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 626631 - 2¹ = 626629 is a prime.

It is a super-2 number, since 2×626631² = 785332820322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626611) 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, 104436 + ... + 104441.

It is an arithmetic number, because the mean of its divisors is an integer number (208878).

2⁶²⁶⁶³¹ is an apocalyptic number.

626631 is a deficient number, since it is larger than the sum of its proper divisors (208881).

626631 is a wasteful number, since it uses less digits than its factorization.

626631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208880.

The product of its digits is 1296, while the sum is 24.

The square root of 626631 is about 791.6002779181. The cubic root of 626631 is about 85.5731052871.

The spelling of 626631 in words is "six hundred twenty-six thousand, six hundred thirty-one".