18244091 has 4 divisors (see below), whose sum is σ = 18277992. Its totient is φ = 18210192.

The previous prime is 18244067. The next prime is 18244117. The reversal of 18244091 is 19044281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19044281 = 67 ⋅284243.

It is a cyclic number.

It is not a de Polignac number, because 18244091 - 2¹⁰ = 18243067 is a prime.

It is a super-3 number, since 3×18244091³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18244001) 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, 16130 + ... + 17223.

It is an arithmetic number, because the mean of its divisors is an integer number (4569498).

Almost surely, 2^18244091 is an apocalyptic number.

18244091 is a deficient number, since it is larger than the sum of its proper divisors (33901).

18244091 is an equidigital number, since it uses as much as digits as its factorization.

18244091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33900.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18244091 is about 4271.3102205295. The cubic root of 18244091 is about 263.2534531343.

The spelling of 18244091 in words is "eighteen million, two hundred forty-four thousand, ninety-one".