25791921 has 12 divisors (see below), whose sum is σ = 37618048. Its totient is φ = 17027064.

The previous prime is 25791877. The next prime is 25791929. The reversal of 25791921 is 12919752.

It is not a de Polignac number, because 25791921 - 2¹¹ = 25789873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25791929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12985 + ... + 14838.

Almost surely, 2^25791921 is an apocalyptic number.

It is an amenable number.

25791921 is a deficient number, since it is larger than the sum of its proper divisors (11826127).

25791921 is a wasteful number, since it uses less digits than its factorization.

25791921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27932 (or 27929 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 25791921 is about 5078.5747016264. The cubic root of 25791921 is about 295.4571901531.

The spelling of 25791921 in words is "twenty-five million, seven hundred ninety-one thousand, nine hundred twenty-one".