318020217 has 16 divisors (see below), whose sum is σ = 445621440. Its totient is φ = 201483072.

The previous prime is 318020201. The next prime is 318020221. The reversal of 318020217 is 712020813.

It is not a de Polignac number, because 318020217 - 2⁴ = 318020201 is a prime.

It is a super-2 number, since 2×318020217² = 202273716841454178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (318022217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28542 + ... + 38087.

It is an arithmetic number, because the mean of its divisors is an integer number (27851340).

Almost surely, 2^318020217 is an apocalyptic number.

318020217 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

318020217 is a deficient number, since it is larger than the sum of its proper divisors (127601223).

318020217 is a wasteful number, since it uses less digits than its factorization.

318020217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66712.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 318020217 is about 17833.1213476497. The cubic root of 318020217 is about 682.5768840918.

The spelling of 318020217 in words is "three hundred eighteen million, twenty thousand, two hundred seventeen".