25684591 has 2 divisors, whose sum is σ = 25684592. Its totient is φ = 25684590.

The previous prime is 25684577. The next prime is 25684597. The reversal of 25684591 is 19548652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25684591 - 2¹⁷ = 25553519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25684597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12842295 + 12842296.

It is an arithmetic number, because the mean of its divisors is an integer number (12842296).

Almost surely, 2^25684591 is an apocalyptic number.

25684591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25684591 is an equidigital number, since it uses as much as digits as its factorization.

25684591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 25684591 is about 5067.9967442768. The cubic root of 25684591 is about 295.0467837322.

The spelling of 25684591 in words is "twenty-five million, six hundred eighty-four thousand, five hundred ninety-one".