25631791 has 2 divisors, whose sum is σ = 25631792. Its totient is φ = 25631790.

The previous prime is 25631777. The next prime is 25631813. The reversal of 25631791 is 19713652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25631791 - 2⁹ = 25631279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25631731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12815895 + 12815896.

It is an arithmetic number, because the mean of its divisors is an integer number (12815896).

Almost surely, 2^25631791 is an apocalyptic number.

25631791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25631791 is an equidigital number, since it uses as much as digits as its factorization.

25631791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 25631791 is about 5062.7849055633. The cubic root of 25631791 is about 294.8444684307.

The spelling of 25631791 in words is "twenty-five million, six hundred thirty-one thousand, seven hundred ninety-one".