321331973 has 2 divisors, whose sum is σ = 321331974. Its totient is φ = 321331972.

The previous prime is 321331849. The next prime is 321331981. The reversal of 321331973 is 379133123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297838564 + 23493409 = 17258^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 321331973 - 2²⁸ = 52896517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321331573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160665986 + 160665987.

It is an arithmetic number, because the mean of its divisors is an integer number (160665987).

Almost surely, 2^321331973 is an apocalyptic number.

It is an amenable number.

321331973 is a deficient number, since it is larger than the sum of its proper divisors (1).

321331973 is an equidigital number, since it uses as much as digits as its factorization.

321331973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 32.

The square root of 321331973 is about 17925.7349361191. The cubic root of 321331973 is about 684.9380823853.

The spelling of 321331973 in words is "three hundred twenty-one million, three hundred thirty-one thousand, nine hundred seventy-three".