621205925 has 12 divisors (see below), whose sum is σ = 815607396. Its totient is φ = 467731200.

The previous prime is 621205889. The next prime is 621205957. The reversal of 621205925 is 529502126.

It can be written as a sum of positive squares in 6 ways, for example, as 64529089 + 556676836 = 8033^2 + 23594^2 .

It is not a de Polignac number, because 621205925 - 2¹⁶ = 621140389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 621205891 and 621205900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 730406 + ... + 731255.

It is an arithmetic number, because the mean of its divisors is an integer number (67967283).

Almost surely, 2^621205925 is an apocalyptic number.

It is an amenable number.

621205925 is a deficient number, since it is larger than the sum of its proper divisors (194401471).

621205925 is a wasteful number, since it uses less digits than its factorization.

621205925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461688 (or 1461683 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 621205925 is about 24924.0029890866. The cubic root of 621205925 is about 853.2543868038.

The spelling of 621205925 in words is "six hundred twenty-one million, two hundred five thousand, nine hundred twenty-five".