25658621 has 2 divisors, whose sum is σ = 25658622. Its totient is φ = 25658620.

The previous prime is 25658609. The next prime is 25658629. The reversal of 25658621 is 12685652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 6175225 = 4414^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 25658621 - 2⁶ = 25658557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25658629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829310 + 12829311.

It is an arithmetic number, because the mean of its divisors is an integer number (12829311).

Almost surely, 2^25658621 is an apocalyptic number.

It is an amenable number.

25658621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25658621 is an equidigital number, since it uses as much as digits as its factorization.

25658621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 25658621 is about 5065.4339399503. The cubic root of 25658621 is about 294.9473084096.

The spelling of 25658621 in words is "twenty-five million, six hundred fifty-eight thousand, six hundred twenty-one".