25957691 has 6 divisors (see below), whose sum is σ = 27574740. Its totient is φ = 24430496.

The previous prime is 25957663. The next prime is 25957703. The reversal of 25957691 is 19675952.

It is a happy number.

It is not a de Polignac number, because 25957691 - 2¹⁸ = 25695547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25957891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44621 + ... + 45198.

It is an arithmetic number, because the mean of its divisors is an integer number (4595790).

Almost surely, 2^25957691 is an apocalyptic number.

25957691 is a deficient number, since it is larger than the sum of its proper divisors (1617049).

25957691 is an equidigital number, since it uses as much as digits as its factorization.

25957691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89853 (or 89836 counting only the distinct ones).

The product of its digits is 170100, while the sum is 44.

The square root of 25957691 is about 5094.8690856586. The cubic root of 25957691 is about 296.0888269752.

The spelling of 25957691 in words is "twenty-five million, nine hundred fifty-seven thousand, six hundred ninety-one".