625621 has 2 divisors, whose sum is σ = 625622. Its totient is φ = 625620.

The previous prime is 625609. The next prime is 625627. The reversal of 625621 is 126526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 1521 = 790^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 625621 - 2⁵ = 625589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 625592 and 625601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312810 + 312811.

It is an arithmetic number, because the mean of its divisors is an integer number (312811).

2⁶²⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

625621 is a deficient number, since it is larger than the sum of its proper divisors (1).

625621 is an equidigital number, since it uses as much as digits as its factorization.

625621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 625621 is about 790.9620724156. The cubic root of 625621 is about 85.5271051620.

The spelling of 625621 in words is "six hundred twenty-five thousand, six hundred twenty-one".