25187969 has 2 divisors, whose sum is σ = 25187970. Its totient is φ = 25187968.

The previous prime is 25187963. The next prime is 25187983. The reversal of 25187969 is 96978152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 4892944 = 4505^2 + 2212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25187969 is a prime.

It is a super-2 number, since 2×25187969² = 1268867564689922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25187963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12593984 + 12593985.

It is an arithmetic number, because the mean of its divisors is an integer number (12593985).

Almost surely, 2^25187969 is an apocalyptic number.

It is an amenable number.

25187969 is a deficient number, since it is larger than the sum of its proper divisors (1).

25187969 is an equidigital number, since it uses as much as digits as its factorization.

25187969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 25187969 is about 5018.7616998618. The cubic root of 25187969 is about 293.1327777103.

The spelling of 25187969 in words is "twenty-five million, one hundred eighty-seven thousand, nine hundred sixty-nine".