18125791 has 12 divisors (see below), whose sum is σ = 20274280. Its totient is φ = 16156800.

The previous prime is 18125749. The next prime is 18125801. The reversal of 18125791 is 19752181.

It is a happy number.

It is not a de Polignac number, because 18125791 - 2⁹ = 18125279 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 (18122791) 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, 3841 + ... + 7141.

Almost surely, 2^18125791 is an apocalyptic number.

18125791 is a deficient number, since it is larger than the sum of its proper divisors (2148489).

18125791 is a wasteful number, since it uses less digits than its factorization.

18125791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354 (or 3337 counting only the distinct ones).

The product of its digits is 5040, while the sum is 34.

The square root of 18125791 is about 4257.4394887068. The cubic root of 18125791 is about 262.6832147994.

The spelling of 18125791 in words is "eighteen million, one hundred twenty-five thousand, seven hundred ninety-one".