18518901 has 8 divisors (see below), whose sum is σ = 25991520. Its totient is φ = 11696112.

The previous prime is 18518881. The next prime is 18518917. The reversal of 18518901 is 10981581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18518901 - 2⁵ = 18518869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18510901) 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 7 ways as a sum of consecutive naturals, for example, 162390 + ... + 162503.

It is an arithmetic number, because the mean of its divisors is an integer number (3248940).

Almost surely, 2^18518901 is an apocalyptic number.

It is an amenable number.

18518901 is a deficient number, since it is larger than the sum of its proper divisors (7472619).

18518901 is a wasteful number, since it uses less digits than its factorization.

18518901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324915.

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 18518901 is about 4303.3592692221. The cubic root of 18518901 is about 264.5686634367.

The spelling of 18518901 in words is "eighteen million, five hundred eighteen thousand, nine hundred one".