18124991 has 6 divisors (see below), whose sum is σ = 18430776. Its totient is φ = 17824200.

The previous prime is 18124979. The next prime is 18124999. The reversal of 18124991 is 19942181.

It is not a de Polignac number, because 18124991 - 2⁶ = 18124927 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 (18124999) 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, 1286 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (3071796).

Almost surely, 2^18124991 is an apocalyptic number.

18124991 is a deficient number, since it is larger than the sum of its proper divisors (305785).

18124991 is an frugal number, since it uses more digits than its factorization.

18124991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993 (or 4932 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The square root of 18124991 is about 4257.3455344851. The cubic root of 18124991 is about 262.6793501467.

The spelling of 18124991 in words is "eighteen million, one hundred twenty-four thousand, nine hundred ninety-one".