318082221 has 10 divisors (see below), whose sum is σ = 475159982. Its totient is φ = 212054760.

The previous prime is 318082199. The next prime is 318082241. The reversal of 318082221 is 122280813.

It can be written as a sum of positive squares in only one way, i.e., 169364196 + 148718025 = 13014^2 + 12195^2 .

It is not a de Polignac number, because 318082221 - 2¹⁵ = 318049453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318082241) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1963390 + ... + 1963551.

Almost surely, 2^318082221 is an apocalyptic number.

It is an amenable number.

318082221 is a deficient number, since it is larger than the sum of its proper divisors (157077761).

318082221 is an equidigital number, since it uses as much as digits as its factorization.

318082221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926953 (or 3926944 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 318082221 is about 17834.8597134937. The cubic root of 318082221 is about 682.6212415934.

The spelling of 318082221 in words is "three hundred eighteen million, eighty-two thousand, two hundred twenty-one".