25564261 has 2 divisors, whose sum is σ = 25564262. Its totient is φ = 25564260.

The previous prime is 25564237. The next prime is 25564303. The reversal of 25564261 is 16246552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 11236 = 5055^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 25564261 - 2⁵ = 25564229 is a prime.

It is a super-2 number, since 2×25564261² = 1307062880952242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25564961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782130 + 12782131.

It is an arithmetic number, because the mean of its divisors is an integer number (12782131).

Almost surely, 2^25564261 is an apocalyptic number.

It is an amenable number.

25564261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25564261 is an equidigital number, since it uses as much as digits as its factorization.

25564261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 25564261 is about 5056.1112527317. Note that the first 3 decimals coincide. The cubic root of 25564261 is about 294.5853064338.

It can be divided in two parts, 255 and 64261, that added together give a square (64516 = 254²).

The spelling of 25564261 in words is "twenty-five million, five hundred sixty-four thousand, two hundred sixty-one".