621321625 has 16 divisors (see below), whose sum is σ = 788561280. Its totient is φ = 488626800.

The previous prime is 621321611. The next prime is 621321637. The reversal of 621321625 is 526123126.

It is a de Polignac number, because none of the positive numbers 2^k-621321625 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621321593 and 621321602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34749 + ... + 49498.

It is an arithmetic number, because the mean of its divisors is an integer number (49285080).

Almost surely, 2^621321625 is an apocalyptic number.

It is an amenable number.

621321625 is a deficient number, since it is larger than the sum of its proper divisors (167239655).

621321625 is an equidigital number, since it uses as much as digits as its factorization.

621321625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84321 (or 84311 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 621321625 is about 24926.3239367541. The cubic root of 621321625 is about 853.3073565735.

The spelling of 621321625 in words is "six hundred twenty-one million, three hundred twenty-one thousand, six hundred twenty-five".