25488581 has 2 divisors, whose sum is σ = 25488582. Its totient is φ = 25488580.

The previous prime is 25488521. The next prime is 25488587. The reversal of 25488581 is 18588452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 9247681 = 4030^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 25488581 - 2¹⁸ = 25226437 is a prime.

It is a super-2 number, since 2×25488581² = 1299335522787122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25488587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12744290 + 12744291.

It is an arithmetic number, because the mean of its divisors is an integer number (12744291).

Almost surely, 2^25488581 is an apocalyptic number.

It is an amenable number.

25488581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25488581 is an equidigital number, since it uses as much as digits as its factorization.

25488581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102400, while the sum is 41.

The square root of 25488581 is about 5048.6216930960. The cubic root of 25488581 is about 294.2943240078.

The spelling of 25488581 in words is "twenty-five million, four hundred eighty-eight thousand, five hundred eighty-one".