621651117 has 16 divisors (see below), whose sum is σ = 833269760. Its totient is φ = 412240752.

The previous prime is 621651113. The next prime is 621651119. The reversal of 621651117 is 711156126.

It is not a de Polignac number, because 621651117 - 2² = 621651113 is a prime.

It is a super-2 number, since 2×621651117² = 772900222534695378, 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 (621651113) 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, 675984 + ... + 676902.

It is an arithmetic number, because the mean of its divisors is an integer number (52079360).

Almost surely, 2^621651117 is an apocalyptic number.

It is an amenable number.

621651117 is a deficient number, since it is larger than the sum of its proper divisors (211618643).

621651117 is a wasteful number, since it uses less digits than its factorization.

621651117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its digits is 2520, while the sum is 30.

The square root of 621651117 is about 24932.9323786834. The cubic root of 621651117 is about 853.4581685688.

The spelling of 621651117 in words is "six hundred twenty-one million, six hundred fifty-one thousand, one hundred seventeen".