25456391 has 2 divisors, whose sum is σ = 25456392. Its totient is φ = 25456390.

The previous prime is 25456351. The next prime is 25456397. The reversal of 25456391 is 19365452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25456391 is a prime.

It is a Sophie Germain 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 (25456397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12728195 + 12728196.

It is an arithmetic number, because the mean of its divisors is an integer number (12728196).

Almost surely, 2^25456391 is an apocalyptic number.

25456391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25456391 is an equidigital number, since it uses as much as digits as its factorization.

25456391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 25456391 is about 5045.4326870943. The cubic root of 25456391 is about 294.1703819034.

The spelling of 25456391 in words is "twenty-five million, four hundred fifty-six thousand, three hundred ninety-one".