25621369 has 2 divisors, whose sum is σ = 25621370. Its totient is φ = 25621368.

The previous prime is 25621339. The next prime is 25621417. The reversal of 25621369 is 96312652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25371369 + 250000 = 5037^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 25621369 - 2⁹ = 25620857 is a prime.

It is a super-2 number, since 2×25621369² = 1312909098868322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25621339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810684 + 12810685.

It is an arithmetic number, because the mean of its divisors is an integer number (12810685).

Almost surely, 2^25621369 is an apocalyptic number.

It is an amenable number.

25621369 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621369 is an equidigital number, since it uses as much as digits as its factorization.

25621369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 25621369 is about 5061.7555255069. The cubic root of 25621369 is about 294.8045013234.

The spelling of 25621369 in words is "twenty-five million, six hundred twenty-one thousand, three hundred sixty-nine".