25431569 has 2 divisors, whose sum is σ = 25431570. Its totient is φ = 25431568.

The previous prime is 25431517. The next prime is 25431577. The reversal of 25431569 is 96513452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 6838225 = 4312^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 25431569 - 2⁸ = 25431313 is a prime.

It is a super-2 number, since 2×25431569² = 1293529403603522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25431509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715784 + 12715785.

It is an arithmetic number, because the mean of its divisors is an integer number (12715785).

Almost surely, 2^25431569 is an apocalyptic number.

It is an amenable number.

25431569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25431569 is an equidigital number, since it uses as much as digits as its factorization.

25431569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 25431569 is about 5042.9722386704. The cubic root of 25431569 is about 294.0747376594.

The spelling of 25431569 in words is "twenty-five million, four hundred thirty-one thousand, five hundred sixty-nine".