621621125 has 8 divisors (see below), whose sum is σ = 775783320. Its totient is φ = 497296800.

The previous prime is 621621079. The next prime is 621621137. The reversal of 621621125 is 521126126.

It can be written as a sum of positive squares in 4 ways, for example, as 35545444 + 586075681 = 5962^2 + 24209^2 .

It is not a de Polignac number, because 621621125 - 2⁸ = 621620869 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 621621094 and 621621103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486360 + ... + 2486609.

It is an arithmetic number, because the mean of its divisors is an integer number (96972915).

Almost surely, 2^621621125 is an apocalyptic number.

It is an amenable number.

621621125 is a deficient number, since it is larger than the sum of its proper divisors (154162195).

621621125 is an equidigital number, since it uses as much as digits as its factorization.

621621125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972984 (or 4972974 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 621621125 is about 24932.3309179066. The cubic root of 621621125 is about 853.4444431161. Note that the first 5 decimals are identical.

The spelling of 621621125 in words is "six hundred twenty-one million, six hundred twenty-one thousand, one hundred twenty-five".