18518541 has 4 divisors (see below), whose sum is σ = 24691392. Its totient is φ = 12345692.

The previous prime is 18518531. The next prime is 18518551. The reversal of 18518541 is 14581581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18518531) and next prime (18518551).

It is a cyclic number.

It is not a de Polignac number, because 18518541 - 2⁶ = 18518477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3086421 + ... + 3086426.

It is an arithmetic number, because the mean of its divisors is an integer number (6172848).

Almost surely, 2^18518541 is an apocalyptic number.

It is an amenable number.

18518541 is a deficient number, since it is larger than the sum of its proper divisors (6172851).

18518541 is an equidigital number, since it uses as much as digits as its factorization.

18518541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172850.

The product of its digits is 6400, while the sum is 33.

The square root of 18518541 is about 4303.3174412307. The cubic root of 18518541 is about 264.5669490560.

The spelling of 18518541 in words is "eighteen million, five hundred eighteen thousand, five hundred forty-one".