318881 has 2 divisors, whose sum is σ = 318882. Its totient is φ = 318880.

The previous prime is 318863. The next prime is 318883. The reversal of 318881 is 188813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312481 + 6400 = 559^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 318881 - 2⁶ = 318817 is a prime.

It is a super-2 number, since 2×318881² = 203370184322, which contains 22 as substring.

Together with 318883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159440 + 159441.

It is an arithmetic number, because the mean of its divisors is an integer number (159441).

2³¹⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

318881 is a deficient number, since it is larger than the sum of its proper divisors (1).

318881 is an equidigital number, since it uses as much as digits as its factorization.

318881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 29.

The square root of 318881 is about 564.6954931642. The cubic root of 318881 is about 68.3192171251.

The spelling of 318881 in words is "three hundred eighteen thousand, eight hundred eighty-one".