321138017 has 2 divisors, whose sum is σ = 321138018. Its totient is φ = 321138016.

The previous prime is 321137989. The next prime is 321138031. The reversal of 321138017 is 710831123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274366096 + 46771921 = 16564^2 + 6839^2 .

It is a cyclic number.

It is not a de Polignac number, because 321138017 - 2²⁴ = 304360801 is a prime.

It is not a weakly prime, because it can be changed into another prime (321138047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160569008 + 160569009.

It is an arithmetic number, because the mean of its divisors is an integer number (160569009).

Almost surely, 2^321138017 is an apocalyptic number.

It is an amenable number.

321138017 is a deficient number, since it is larger than the sum of its proper divisors (1).

321138017 is an equidigital number, since it uses as much as digits as its factorization.

321138017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 321138017 is about 17920.3241321132. The cubic root of 321138017 is about 684.8002450916.

The spelling of 321138017 in words is "three hundred twenty-one million, one hundred thirty-eight thousand, seventeen".