25536691 has 2 divisors, whose sum is σ = 25536692. Its totient is φ = 25536690.

The previous prime is 25536689. The next prime is 25536701. The reversal of 25536691 is 19663552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25536691 - 2¹ = 25536689 is a prime.

Together with 25536689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25536691.

It is not a weakly prime, because it can be changed into another prime (25536631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12768345 + 12768346.

It is an arithmetic number, because the mean of its divisors is an integer number (12768346).

Almost surely, 2^25536691 is an apocalyptic number.

25536691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25536691 is an equidigital number, since it uses as much as digits as its factorization.

25536691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 25536691 is about 5053.3841136411. The cubic root of 25536691 is about 294.4793689782.

The spelling of 25536691 in words is "twenty-five million, five hundred thirty-six thousand, six hundred ninety-one".