25630621 has 2 divisors, whose sum is σ = 25630622. Its totient is φ = 25630620.

The previous prime is 25630607. The next prime is 25630637. The reversal of 25630621 is 12603652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 16900 = 5061^2 + 130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25630621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25630421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12815310 + 12815311.

It is an arithmetic number, because the mean of its divisors is an integer number (12815311).

Almost surely, 2^25630621 is an apocalyptic number.

It is an amenable number.

25630621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25630621 is an equidigital number, since it uses as much as digits as its factorization.

25630621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 25630621 is about 5062.6693551920. The cubic root of 25630621 is about 294.8399821624.

The spelling of 25630621 in words is "twenty-five million, six hundred thirty thousand, six hundred twenty-one".