25508291 has 2 divisors, whose sum is σ = 25508292. Its totient is φ = 25508290.

The previous prime is 25508269. The next prime is 25508293. The reversal of 25508291 is 19280552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25508291 is a prime.

It is a Sophie Germain prime.

Together with 25508293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25508293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12754145 + 12754146.

It is an arithmetic number, because the mean of its divisors is an integer number (12754146).

Almost surely, 2^25508291 is an apocalyptic number.

25508291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25508291 is an equidigital number, since it uses as much as digits as its factorization.

25508291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 25508291 is about 5050.5733337909. The cubic root of 25508291 is about 294.3701624994.

The spelling of 25508291 in words is "twenty-five million, five hundred eight thousand, two hundred ninety-one".