25613569 has 2 divisors, whose sum is σ = 25613570. Its totient is φ = 25613568.

The previous prime is 25613531. The next prime is 25613587. The reversal of 25613569 is 96531652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13046544 + 12567025 = 3612^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 25613569 - 2²¹ = 23516417 is a prime.

It is a super-2 number, since 2×25613569² = 1312109833835522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25613969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806784 + 12806785.

It is an arithmetic number, because the mean of its divisors is an integer number (12806785).

Almost surely, 2^25613569 is an apocalyptic number.

It is an amenable number.

25613569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25613569 is an equidigital number, since it uses as much as digits as its factorization.

25613569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 25613569 is about 5060.9849831826. The cubic root of 25613569 is about 294.7745821767.

The spelling of 25613569 in words is "twenty-five million, six hundred thirteen thousand, five hundred sixty-nine".