25861687 has 2 divisors, whose sum is σ = 25861688. Its totient is φ = 25861686.

The previous prime is 25861669. The next prime is 25861691. The reversal of 25861687 is 78616852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25861687 - 2¹⁵ = 25828919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25861697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12930843 + 12930844.

It is an arithmetic number, because the mean of its divisors is an integer number (12930844).

Almost surely, 2^25861687 is an apocalyptic number.

25861687 is a deficient number, since it is larger than the sum of its proper divisors (1).

25861687 is an equidigital number, since it uses as much as digits as its factorization.

25861687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 25861687 is about 5085.4387224703. The cubic root of 25861687 is about 295.7233498365.

The spelling of 25861687 in words is "twenty-five million, eight hundred sixty-one thousand, six hundred eighty-seven".