25638791 has 2 divisors, whose sum is σ = 25638792. Its totient is φ = 25638790.

The previous prime is 25638757. The next prime is 25638797. The reversal of 25638791 is 19783652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25638791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25638797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12819395 + 12819396.

It is an arithmetic number, because the mean of its divisors is an integer number (12819396).

Almost surely, 2^25638791 is an apocalyptic number.

25638791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25638791 is an equidigital number, since it uses as much as digits as its factorization.

25638791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 25638791 is about 5063.4761774891. The cubic root of 25638791 is about 294.8713065010.

The spelling of 25638791 in words is "twenty-five million, six hundred thirty-eight thousand, seven hundred ninety-one".