18249000491 has 4 divisors (see below), whose sum is σ = 18878276400. Its totient is φ = 17619724584.

The previous prime is 18249000449. The next prime is 18249000521. The reversal of 18249000491 is 19400094281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19400094281 = 3467 ⋅5595643.

It is a cyclic number.

It is not a de Polignac number, because 18249000491 - 2¹⁰ = 18248999467 is a prime.

It is a pancake number, because a pancake can be divided into 18249000491 parts by 191044 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18249009491) 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, 314637911 + ... + 314637968.

It is an arithmetic number, because the mean of its divisors is an integer number (4719569100).

Almost surely, 2^18249000491 is an apocalyptic number.

18249000491 is a deficient number, since it is larger than the sum of its proper divisors (629275909).

18249000491 is an equidigital number, since it uses as much as digits as its factorization.

18249000491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629275908.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 18249000491 in words is "eighteen billion, two hundred forty-nine million, four hundred ninety-one", and thus it is an aban number.