18091249 has 8 divisors (see below), whose sum is σ = 20774880. Its totient is φ = 15580800.

The previous prime is 18091243. The next prime is 18091279. The reversal of 18091249 is 94219081.

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

It is a cyclic number.

It is not a de Polignac number, because 18091249 - 2⁵ = 18091217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18091243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43072 + ... + 43489.

It is an arithmetic number, because the mean of its divisors is an integer number (2596860).

Almost surely, 2^18091249 is an apocalyptic number.

18091249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18091249 is a deficient number, since it is larger than the sum of its proper divisors (2683631).

18091249 is a wasteful number, since it uses less digits than its factorization.

18091249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86591.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18091249 is about 4253.3808905387. The cubic root of 18091249 is about 262.5162451020.

It can be divided in two parts, 180912 and 49, that multiplied together give a palindrome (8864688).

The spelling of 18091249 in words is "eighteen million, ninety-one thousand, two hundred forty-nine".