25520569 has 2 divisors, whose sum is σ = 25520570. Its totient is φ = 25520568.

The previous prime is 25520563. The next prime is 25520597. The reversal of 25520569 is 96502552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14531344 + 10989225 = 3812^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520569 - 2²¹ = 23423417 is a prime.

It is a super-2 number, since 2×25520569² = 1302598884167522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25520563) 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, 12760284 + 12760285.

It is an arithmetic number, because the mean of its divisors is an integer number (12760285).

Almost surely, 2^25520569 is an apocalyptic number.

It is an amenable number.

25520569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520569 is an equidigital number, since it uses as much as digits as its factorization.

25520569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 25520569 is about 5051.7886931264. The cubic root of 25520569 is about 294.4173850164.

It can be divided in two parts, 255205 and 69, that multiplied together give a triangular number (17609145 = T₅₉₃₄).

The spelling of 25520569 in words is "twenty-five million, five hundred twenty thousand, five hundred sixty-nine".