318769021 has 2 divisors, whose sum is σ = 318769022. Its totient is φ = 318769020.

The previous prime is 318768979. The next prime is 318769037. The reversal of 318769021 is 120967813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175032900 + 143736121 = 13230^2 + 11989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318769021 is a prime.

It is a super-2 number, since 2×318769021² = 203227377498596882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318769051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159384510 + 159384511.

It is an arithmetic number, because the mean of its divisors is an integer number (159384511).

Almost surely, 2^318769021 is an apocalyptic number.

It is an amenable number.

318769021 is a deficient number, since it is larger than the sum of its proper divisors (1).

318769021 is an equidigital number, since it uses as much as digits as its factorization.

318769021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 318769021 is about 17854.1037579600. The cubic root of 318769021 is about 683.1121914329.

The spelling of 318769021 in words is "three hundred eighteen million, seven hundred sixty-nine thousand, twenty-one".