18170013 has 4 divisors (see below), whose sum is σ = 24226688. Its totient is φ = 12113340.

The previous prime is 18169967. The next prime is 18170027. The reversal of 18170013 is 31007181.

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: 31007181 = 3 ⋅10335727.

It is not a de Polignac number, because 18170013 - 2¹⁰ = 18168989 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 (18170063) 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, 3028333 + ... + 3028338.

It is an arithmetic number, because the mean of its divisors is an integer number (6056672).

Almost surely, 2^18170013 is an apocalyptic number.

It is an amenable number.

18170013 is a deficient number, since it is larger than the sum of its proper divisors (6056675).

18170013 is an equidigital number, since it uses as much as digits as its factorization.

18170013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6056674.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 18170013 is about 4262.6298220699. The cubic root of 18170013 is about 262.8966665043.

Adding to 18170013 its reverse (31007181), we get a palindrome (49177194).

The spelling of 18170013 in words is "eighteen million, one hundred seventy thousand, thirteen".