321913937 has 2 divisors, whose sum is σ = 321913938. Its totient is φ = 321913936.

The previous prime is 321913931. The next prime is 321913987. The reversal of 321913937 is 739319123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319837456 + 2076481 = 17884^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 321913937 - 2⁶ = 321913873 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321913937.

It is not a weakly prime, because it can be changed into another prime (321913931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160956968 + 160956969.

It is an arithmetic number, because the mean of its divisors is an integer number (160956969).

Almost surely, 2^321913937 is an apocalyptic number.

It is an amenable number.

321913937 is a deficient number, since it is larger than the sum of its proper divisors (1).

321913937 is an equidigital number, since it uses as much as digits as its factorization.

321913937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 38.

The square root of 321913937 is about 17941.9602329288. The cubic root of 321913937 is about 685.3513298897.

The spelling of 321913937 in words is "three hundred twenty-one million, nine hundred thirteen thousand, nine hundred thirty-seven".