25265521 has 2 divisors, whose sum is σ = 25265522. Its totient is φ = 25265520.

The previous prime is 25265509. The next prime is 25265549. The reversal of 25265521 is 12556252.

It is an a-pointer prime, because the next prime (25265549) can be obtained adding 25265521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 1849600 = 4839^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 25265521 - 2¹¹ = 25263473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25265521.

It is not a weakly prime, because it can be changed into another prime (25265021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12632760 + 12632761.

It is an arithmetic number, because the mean of its divisors is an integer number (12632761).

Almost surely, 2^25265521 is an apocalyptic number.

It is an amenable number.

25265521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25265521 is an equidigital number, since it uses as much as digits as its factorization.

25265521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 28.

The square root of 25265521 is about 5026.4819705237. The cubic root of 25265521 is about 293.4333146037.

The spelling of 25265521 in words is "twenty-five million, two hundred sixty-five thousand, five hundred twenty-one".