318722881 has 2 divisors, whose sum is σ = 318722882. Its totient is φ = 318722880.

The previous prime is 318722861. The next prime is 318722903. The reversal of 318722881 is 188227813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299843856 + 18879025 = 17316^2 + 4345^2 .

It is a cyclic number.

It is not a de Polignac number, because 318722881 - 2⁵ = 318722849 is a prime.

It is a super-2 number, since 2×318722881² = 203168549745880322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318722821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159361440 + 159361441.

It is an arithmetic number, because the mean of its divisors is an integer number (159361441).

Almost surely, 2^318722881 is an apocalyptic number.

It is an amenable number.

318722881 is a deficient number, since it is larger than the sum of its proper divisors (1).

318722881 is an equidigital number, since it uses as much as digits as its factorization.

318722881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 318722881 is about 17852.8115712904. The cubic root of 318722881 is about 683.0792309764.

The spelling of 318722881 in words is "three hundred eighteen million, seven hundred twenty-two thousand, eight hundred eighty-one".