18337313 has 6 divisors (see below), whose sum is σ = 18491046. Its totient is φ = 18184832.

The previous prime is 18337283. The next prime is 18337321. The reversal of 18337313 is 31373381.

It can be written as a sum of positive squares in 3 ways, for example, as 8427409 + 9909904 = 2903^2 + 3148^2 .

It is not a de Polignac number, because 18337313 - 2⁸ = 18337057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18337343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18281 + ... + 19257.

It is an arithmetic number, because the mean of its divisors is an integer number (3081841).

Almost surely, 2^18337313 is an apocalyptic number.

It is an amenable number.

18337313 is a deficient number, since it is larger than the sum of its proper divisors (153733).

18337313 is an frugal number, since it uses more digits than its factorization.

18337313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1114 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 18337313 is about 4282.2088926161. The cubic root of 18337313 is about 263.7010744585.

The spelling of 18337313 in words is "eighteen million, three hundred thirty-seven thousand, three hundred thirteen".