621404125 has 16 divisors (see below), whose sum is σ = 785341440. Its totient is φ = 490822800.

The previous prime is 621404099. The next prime is 621404129. The reversal of 621404125 is 521404126.

It is a happy number.

It is not a de Polignac number, because 621404125 - 2⁹ = 621403613 is a prime.

It is a super-2 number, since 2×621404125² = 772286173134031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 621404125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621404129) 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, 21589 + ... + 41338.

It is an arithmetic number, because the mean of its divisors is an integer number (49083840).

Almost surely, 2^621404125 is an apocalyptic number.

It is an amenable number.

621404125 is a deficient number, since it is larger than the sum of its proper divisors (163937315).

621404125 is an equidigital number, since it uses as much as digits as its factorization.

621404125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63021 (or 63011 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 621404125 is about 24927.9787588164. The cubic root of 621404125 is about 853.3451227043.

Subtracting from 621404125 its reverse (521404126), we obtain a palindrome (99999999).

The spelling of 621404125 in words is "six hundred twenty-one million, four hundred four thousand, one hundred twenty-five".