6425621 has 2 divisors, whose sum is σ = 6425622. Its totient is φ = 6425620.

The previous prime is 6425599. The next prime is 6425641. The reversal of 6425621 is 1265246.

6425621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5640625 + 784996 = 2375^2 + 886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6425621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6425641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3212810 + 3212811.

It is an arithmetic number, because the mean of its divisors is an integer number (3212811).

Almost surely, 2^6425621 is an apocalyptic number.

It is an amenable number.

6425621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6425621 is an equidigital number, since it uses as much as digits as its factorization.

6425621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 6425621 is about 2534.8808650507. The cubic root of 6425621 is about 185.9109779415.

The spelling of 6425621 in words is "six million, four hundred twenty-five thousand, six hundred twenty-one".