321990413 has 2 divisors, whose sum is σ = 321990414. Its totient is φ = 321990412.

The previous prime is 321990379. The next prime is 321990457. The reversal of 321990413 is 314099123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309302569 + 12687844 = 17587^2 + 3562^2 .

It is a cyclic number.

It is not a de Polignac number, because 321990413 - 2⁶ = 321990349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321990413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321990113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160995206 + 160995207.

It is an arithmetic number, because the mean of its divisors is an integer number (160995207).

Almost surely, 2^321990413 is an apocalyptic number.

It is an amenable number.

321990413 is a deficient number, since it is larger than the sum of its proper divisors (1).

321990413 is an equidigital number, since it uses as much as digits as its factorization.

321990413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 321990413 is about 17944.0913116268. The cubic root of 321990413 is about 685.4055977879.

The spelling of 321990413 in words is "three hundred twenty-one million, nine hundred ninety thousand, four hundred thirteen".