18636313 has 4 divisors (see below), whose sum is σ = 18655588. Its totient is φ = 18617040.

The previous prime is 18636307. The next prime is 18636323. The reversal of 18636313 is 31363681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31363681 = 2053 ⋅15277.

It can be written as a sum of positive squares in 2 ways, for example, as 3674889 + 14961424 = 1917^2 + 3868^2 .

It is a cyclic number.

It is not a de Polignac number, because 18636313 - 2⁵ = 18636281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18636323) 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, 8106 + ... + 10147.

It is an arithmetic number, because the mean of its divisors is an integer number (4663897).

Almost surely, 2^18636313 is an apocalyptic number.

It is an amenable number.

18636313 is a deficient number, since it is larger than the sum of its proper divisors (19275).

18636313 is a wasteful number, since it uses less digits than its factorization.

18636313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19274.

The product of its digits is 7776, while the sum is 31.

The square root of 18636313 is about 4316.9796154256. The cubic root of 18636313 is about 265.1266180251.

Adding to 18636313 its reverse (31363681), we get a palindrome (49999994).

The spelling of 18636313 in words is "eighteen million, six hundred thirty-six thousand, three hundred thirteen".