218032313 has 4 divisors (see below), whose sum is σ = 218968308. Its totient is φ = 217096320.

The previous prime is 218032303. The next prime is 218032319. The reversal of 218032313 is 313230812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132894784 + 85137529 = 11528^2 + 9227^2 .

It is a cyclic number.

It is not a de Polignac number, because 218032313 - 2²⁰ = 216983737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218032319) 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, 467648 + ... + 468113.

It is an arithmetic number, because the mean of its divisors is an integer number (54742077).

Almost surely, 2^218032313 is an apocalyptic number.

It is an amenable number.

218032313 is a deficient number, since it is larger than the sum of its proper divisors (935995).

218032313 is an equidigital number, since it uses as much as digits as its factorization.

218032313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935994.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 218032313 is about 14765.9172759433. The cubic root of 218032313 is about 601.8759001815.

The spelling of 218032313 in words is "two hundred eighteen million, thirty-two thousand, three hundred thirteen".