218314917 has 6 divisors (see below), whose sum is σ = 315343782. Its totient is φ = 145543272.

The previous prime is 218314907. The next prime is 218314933. The reversal of 218314917 is 719413812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 123076836 + 95238081 = 11094^2 + 9759^2 .

It is not a de Polignac number, because 218314917 - 2⁸ = 218314661 is a prime.

It is a super-2 number, since 2×218314917² = 95322805969433778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218314907) 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, 12128598 + ... + 12128615.

It is an arithmetic number, because the mean of its divisors is an integer number (52557297).

Almost surely, 2^218314917 is an apocalyptic number.

It is an amenable number.

218314917 is a deficient number, since it is larger than the sum of its proper divisors (97028865).

218314917 is a wasteful number, since it uses less digits than its factorization.

218314917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24257219 (or 24257216 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 218314917 is about 14775.4836469065. The cubic root of 218314917 is about 602.1358296977.

The spelling of 218314917 in words is "two hundred eighteen million, three hundred fourteen thousand, nine hundred seventeen".