318421331 has 2 divisors, whose sum is σ = 318421332. Its totient is φ = 318421330.

The previous prime is 318421261. The next prime is 318421333. The reversal of 318421331 is 133124813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318421331 - 2¹⁸ = 318159187 is a prime.

It is a super-2 number, since 2×318421331² = 202784288071623122, which contains 22 as substring.

Together with 318421333, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 318421331.

It is not a weakly prime, because it can be changed into another prime (318421333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159210665 + 159210666.

It is an arithmetic number, because the mean of its divisors is an integer number (159210666).

Almost surely, 2^318421331 is an apocalyptic number.

318421331 is a deficient number, since it is larger than the sum of its proper divisors (1).

318421331 is an equidigital number, since it uses as much as digits as its factorization.

318421331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 318421331 is about 17844.3641242831. The cubic root of 318421331 is about 682.8637380932.

The spelling of 318421331 in words is "three hundred eighteen million, four hundred twenty-one thousand, three hundred thirty-one".