18485513 has 4 divisors (see below), whose sum is σ = 18665088. Its totient is φ = 18305940.

The previous prime is 18485503. The next prime is 18485531. The reversal of 18485513 is 31558481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31558481 = 251 ⋅125731.

It is a cyclic number.

It is not a de Polignac number, because 18485513 - 2⁶ = 18485449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18485503) 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, 89633 + ... + 89838.

It is an arithmetic number, because the mean of its divisors is an integer number (4666272).

Almost surely, 2^18485513 is an apocalyptic number.

It is an amenable number.

18485513 is a deficient number, since it is larger than the sum of its proper divisors (179575).

18485513 is a wasteful number, since it uses less digits than its factorization.

18485513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179574.

The product of its digits is 19200, while the sum is 35.

The square root of 18485513 is about 4299.4782241570. The cubic root of 18485513 is about 264.4095695377.

The spelling of 18485513 in words is "eighteen million, four hundred eighty-five thousand, five hundred thirteen".