25497239 has 2 divisors, whose sum is σ = 25497240. Its totient is φ = 25497238.

The previous prime is 25497217. The next prime is 25497281. The reversal of 25497239 is 93279452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25497239 - 2²⁰ = 24448663 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 25497196 and 25497205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25497299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12748619 + 12748620.

It is an arithmetic number, because the mean of its divisors is an integer number (12748620).

Almost surely, 2^25497239 is an apocalyptic number.

25497239 is a deficient number, since it is larger than the sum of its proper divisors (1).

25497239 is an equidigital number, since it uses as much as digits as its factorization.

25497239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 25497239 is about 5049.4790820440. The cubic root of 25497239 is about 294.3276423503.

The spelling of 25497239 in words is "twenty-five million, four hundred ninety-seven thousand, two hundred thirty-nine".