25320961 has 2 divisors, whose sum is σ = 25320962. Its totient is φ = 25320960.

The previous prime is 25320947. The next prime is 25320979. The reversal of 25320961 is 16902352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25310961 + 10000 = 5031^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 25320961 - 2⁵ = 25320929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25320931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660480 + 12660481.

It is an arithmetic number, because the mean of its divisors is an integer number (12660481).

Almost surely, 2^25320961 is an apocalyptic number.

It is an amenable number.

25320961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320961 is an equidigital number, since it uses as much as digits as its factorization.

25320961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 25320961 is about 5031.9937400597. The cubic root of 25320961 is about 293.6477842038.

The spelling of 25320961 in words is "twenty-five million, three hundred twenty thousand, nine hundred sixty-one".