318275021 has 2 divisors, whose sum is σ = 318275022. Its totient is φ = 318275020.

The previous prime is 318274981. The next prime is 318275033. The reversal of 318275021 is 120572813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303142921 + 15132100 = 17411^2 + 3890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318275021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318275051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159137510 + 159137511.

It is an arithmetic number, because the mean of its divisors is an integer number (159137511).

Almost surely, 2^318275021 is an apocalyptic number.

It is an amenable number.

318275021 is a deficient number, since it is larger than the sum of its proper divisors (1).

318275021 is an equidigital number, since it uses as much as digits as its factorization.

318275021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 318275021 is about 17840.2640395259. The cubic root of 318275021 is about 682.7591333970.

The spelling of 318275021 in words is "three hundred eighteen million, two hundred seventy-five thousand, twenty-one".