25425581 has 2 divisors, whose sum is σ = 25425582. Its totient is φ = 25425580.

The previous prime is 25425577. The next prime is 25425671. The reversal of 25425581 is 18552452.

25425581 = 3565² + 3566².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12716356 + 12709225 = 3566^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 25425581 - 2² = 25425577 is a prime.

It is a super-2 number, since 2×25425581² = 1292920338375122, 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 (25425551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712790 + 12712791.

It is an arithmetic number, because the mean of its divisors is an integer number (12712791).

Almost surely, 2^25425581 is an apocalyptic number.

25425581 is the 3566-th centered square number.

It is an amenable number.

25425581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25425581 is an equidigital number, since it uses as much as digits as its factorization.

25425581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16000, while the sum is 32.

The square root of 25425581 is about 5042.3785062210. The cubic root of 25425581 is about 294.0516553536.

The spelling of 25425581 in words is "twenty-five million, four hundred twenty-five thousand, five hundred eighty-one".