25611791 has 4 divisors (see below), whose sum is σ = 26959800. Its totient is φ = 24263784.

The previous prime is 25611779. The next prime is 25611799. The reversal of 25611791 is 19711652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25611791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25611799) 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 in 3 ways as a sum of consecutive naturals, for example, 673976 + ... + 674013.

It is an arithmetic number, because the mean of its divisors is an integer number (6739950).

Almost surely, 2^25611791 is an apocalyptic number.

25611791 is a deficient number, since it is larger than the sum of its proper divisors (1348009).

25611791 is a wasteful number, since it uses less digits than its factorization.

25611791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348008.

The product of its digits is 3780, while the sum is 32.

The square root of 25611791 is about 5060.8093226282. The cubic root of 25611791 is about 294.7677612955.

The spelling of 25611791 in words is "twenty-five million, six hundred eleven thousand, seven hundred ninety-one".