318358021 has 2 divisors, whose sum is σ = 318358022. Its totient is φ = 318358020.

The previous prime is 318358013. The next prime is 318358043. The reversal of 318358021 is 120853813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285981921 + 32376100 = 16911^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 318358021 - 2³ = 318358013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318358421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159179010 + 159179011.

It is an arithmetic number, because the mean of its divisors is an integer number (159179011).

Almost surely, 2^318358021 is an apocalyptic number.

It is an amenable number.

318358021 is a deficient number, since it is larger than the sum of its proper divisors (1).

318358021 is an equidigital number, since it uses as much as digits as its factorization.

318358021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 318358021 is about 17842.5900866438. The cubic root of 318358021 is about 682.8184783859.

The spelling of 318358021 in words is "three hundred eighteen million, three hundred fifty-eight thousand, twenty-one".