25787491 has 2 divisors, whose sum is σ = 25787492. Its totient is φ = 25787490.

The previous prime is 25787471. The next prime is 25787501. The reversal of 25787491 is 19478752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25787491 - 2⁵ = 25787459 is a prime.

It is not a weakly prime, because it can be changed into another prime (25787431) 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, 12893745 + 12893746.

It is an arithmetic number, because the mean of its divisors is an integer number (12893746).

Almost surely, 2^25787491 is an apocalyptic number.

25787491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25787491 is an equidigital number, since it uses as much as digits as its factorization.

25787491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 25787491 is about 5078.1385369050. The cubic root of 25787491 is about 295.4402733533.

The spelling of 25787491 in words is "twenty-five million, seven hundred eighty-seven thousand, four hundred ninety-one".