621489025 has 6 divisors (see below), whose sum is σ = 770646422. Its totient is φ = 497191200.

The previous prime is 621489007. The next prime is 621489097. The reversal of 621489025 is 520984126.

It can be written as a sum of positive squares in 3 ways, for example, as 2076481 + 619412544 = 1441^2 + 24888^2 .

It is not a de Polignac number, because 621489025 - 2²⁷ = 487271297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12429756 + ... + 12429805.

Almost surely, 2^621489025 is an apocalyptic number.

It is an amenable number.

621489025 is a deficient number, since it is larger than the sum of its proper divisors (149157397).

621489025 is a wasteful number, since it uses less digits than its factorization.

621489025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24859571 (or 24859566 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 621489025 is about 24929.6816064706. The cubic root of 621489025 is about 853.3839839964.

The spelling of 621489025 in words is "six hundred twenty-one million, four hundred eighty-nine thousand, twenty-five".