18549131 has 4 divisors (see below), whose sum is σ = 18586512. Its totient is φ = 18511752.

The previous prime is 18549107. The next prime is 18549143. The reversal of 18549131 is 13194581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18549131 - 2¹⁰ = 18548107 is a prime.

It is a super-2 number, since 2×18549131² = 688140521710322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18549101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17936 + ... + 18941.

It is an arithmetic number, because the mean of its divisors is an integer number (4646628).

Almost surely, 2^18549131 is an apocalyptic number.

18549131 is a deficient number, since it is larger than the sum of its proper divisors (37381).

18549131 is an equidigital number, since it uses as much as digits as its factorization.

18549131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37380.

The product of its digits is 4320, while the sum is 32.

The square root of 18549131 is about 4306.8702093283. The cubic root of 18549131 is about 264.7125445944.

The spelling of 18549131 in words is "eighteen million, five hundred forty-nine thousand, one hundred thirty-one".