18255313 has 4 divisors (see below), whose sum is σ = 18273460. Its totient is φ = 18237168.

The previous prime is 18255301. The next prime is 18255337. The reversal of 18255313 is 31355281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31355281 = 61 ⋅514021.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 10029889 = 2868^2 + 3167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18255313 is a prime.

It is a super-3 number, since 3×18255313³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18255343) 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, 7470 + ... + 9607.

It is an arithmetic number, because the mean of its divisors is an integer number (4568365).

Almost surely, 2^18255313 is an apocalyptic number.

It is an amenable number.

18255313 is a deficient number, since it is larger than the sum of its proper divisors (18147).

18255313 is a wasteful number, since it uses less digits than its factorization.

18255313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18146.

The product of its digits is 3600, while the sum is 28.

The square root of 18255313 is about 4272.6236670224. The cubic root of 18255313 is about 263.3074180910.

The spelling of 18255313 in words is "eighteen million, two hundred fifty-five thousand, three hundred thirteen".