621552125 has 8 divisors (see below), whose sum is σ = 775697208. Its totient is φ = 497241600.

The previous prime is 621552109. The next prime is 621552179. The reversal of 621552125 is 521255126.

It can be written as a sum of positive squares in 4 ways, for example, as 10374841 + 611177284 = 3221^2 + 24722^2 .

It is not a de Polignac number, because 621552125 - 2⁴ = 621552109 is a prime.

It is a Duffinian number.

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, 2486084 + ... + 2486333.

It is an arithmetic number, because the mean of its divisors is an integer number (96962151).

Almost surely, 2^621552125 is an apocalyptic number.

It is an amenable number.

621552125 is a deficient number, since it is larger than the sum of its proper divisors (154145083).

621552125 is an equidigital number, since it uses as much as digits as its factorization.

621552125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972432 (or 4972422 counting only the distinct ones).

The product of its digits is 6000, while the sum is 29.

The square root of 621552125 is about 24930.9471340340. The cubic root of 621552125 is about 853.4128644780.

The spelling of 621552125 in words is "six hundred twenty-one million, five hundred fifty-two thousand, one hundred twenty-five".