25191239 has 2 divisors, whose sum is σ = 25191240. Its totient is φ = 25191238.

The previous prime is 25191223. The next prime is 25191241. The reversal of 25191239 is 93219152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25191239 - 2⁴ = 25191223 is a prime.

Together with 25191241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25191209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12595619 + 12595620.

It is an arithmetic number, because the mean of its divisors is an integer number (12595620).

Almost surely, 2^25191239 is an apocalyptic number.

25191239 is a deficient number, since it is larger than the sum of its proper divisors (1).

25191239 is an equidigital number, since it uses as much as digits as its factorization.

25191239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 32.

The square root of 25191239 is about 5019.0874668609. The cubic root of 25191239 is about 293.1454623735.

The spelling of 25191239 in words is "twenty-five million, one hundred ninety-one thousand, two hundred thirty-nine".