25131569 has 2 divisors, whose sum is σ = 25131570. Its totient is φ = 25131568.

The previous prime is 25131541. The next prime is 25131583. The reversal of 25131569 is 96513152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 11478544 = 3695^2 + 3388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25131569 is a prime.

It is a super-2 number, since 2×25131569² = 1263191520803522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1573709 and since 25131569 and 1573709 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25131529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565784 + 12565785.

It is an arithmetic number, because the mean of its divisors is an integer number (12565785).

Almost surely, 2^25131569 is an apocalyptic number.

It is an amenable number.

25131569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131569 is an equidigital number, since it uses as much as digits as its factorization.

25131569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 25131569 is about 5013.1396349992. The cubic root of 25131569 is about 292.9138233908.

The spelling of 25131569 in words is "twenty-five million, one hundred thirty-one thousand, five hundred sixty-nine".