18512573 has 4 divisors (see below), whose sum is σ = 18525180. Its totient is φ = 18499968.

The previous prime is 18512563. The next prime is 18512579. The reversal of 18512573 is 37521581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37521581 = 59 ⋅635959.

It can be written as a sum of positive squares in 2 ways, for example, as 12096484 + 6416089 = 3478^2 + 2533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18512573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512579) 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, 3758 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (4631295).

Almost surely, 2^18512573 is an apocalyptic number.

It is an amenable number.

18512573 is a deficient number, since it is larger than the sum of its proper divisors (12607).

18512573 is a wasteful number, since it uses less digits than its factorization.

18512573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12606.

The product of its digits is 8400, while the sum is 32.

The square root of 18512573 is about 4302.6239668370. The cubic root of 18512573 is about 264.5385251970.

The spelling of 18512573 in words is "eighteen million, five hundred twelve thousand, five hundred seventy-three".