18513245 has 4 divisors (see below), whose sum is σ = 22215900. Its totient is φ = 14810592.

The previous prime is 18513217. The next prime is 18513259. The reversal of 18513245 is 54231581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54231581 = 17 ⋅3190093.

It can be written as a sum of positive squares in 2 ways, for example, as 10413529 + 8099716 = 3227^2 + 2846^2 .

It is a cyclic number.

It is not a de Polignac number, because 18513245 - 2²⁰ = 17464669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851320 + ... + 1851329.

It is an arithmetic number, because the mean of its divisors is an integer number (5553975).

Almost surely, 2^18513245 is an apocalyptic number.

It is an amenable number.

18513245 is a deficient number, since it is larger than the sum of its proper divisors (3702655).

18513245 is an equidigital number, since it uses as much as digits as its factorization.

18513245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702654.

The product of its digits is 4800, while the sum is 29.

The square root of 18513245 is about 4302.7020580096. The cubic root of 18513245 is about 264.5417260439.

The spelling of 18513245 in words is "eighteen million, five hundred thirteen thousand, two hundred forty-five".