25787431 has 2 divisors, whose sum is σ = 25787432. Its totient is φ = 25787430.

The previous prime is 25787423. The next prime is 25787441. The reversal of 25787431 is 13478752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25787431 - 2³ = 25787423 is a prime.

It is a super-2 number, since 2×25787431² = 1329983195159522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25787441) 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, 12893715 + 12893716.

It is an arithmetic number, because the mean of its divisors is an integer number (12893716).

Almost surely, 2^25787431 is an apocalyptic number.

25787431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25787431 is an equidigital number, since it uses as much as digits as its factorization.

25787431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 25787431 is about 5078.1326292250. The cubic root of 25787431 is about 295.4400442185.

The spelling of 25787431 in words is "twenty-five million, seven hundred eighty-seven thousand, four hundred thirty-one".