25320637 has 2 divisors, whose sum is σ = 25320638. Its totient is φ = 25320636.

The previous prime is 25320623. The next prime is 25320641. The reversal of 25320637 is 73602352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 10621081 = 3834^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 25320637 - 2¹⁵ = 25287869 is a prime.

It is a super-2 number, since 2×25320637² = 1282269316171538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25390637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660318 + 12660319.

It is an arithmetic number, because the mean of its divisors is an integer number (12660319).

Almost surely, 2^25320637 is an apocalyptic number.

It is an amenable number.

25320637 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320637 is an equidigital number, since it uses as much as digits as its factorization.

25320637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 25320637 is about 5031.9615459580. The cubic root of 25320637 is about 293.6465317199.

Adding to 25320637 its reverse (73602352), we get a palindrome (98922989).

The spelling of 25320637 in words is "twenty-five million, three hundred twenty thousand, six hundred thirty-seven".