321690001 has 2 divisors, whose sum is σ = 321690002. Its totient is φ = 321690000.

The previous prime is 321689999. The next prime is 321690053. The reversal of 321690001 is 100096123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172239376 + 149450625 = 13124^2 + 12225^2 .

It is a cyclic number.

It is not a de Polignac number, because 321690001 - 2¹ = 321689999 is a prime.

Together with 321689999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (321690071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160845000 + 160845001.

It is an arithmetic number, because the mean of its divisors is an integer number (160845001).

Almost surely, 2^321690001 is an apocalyptic number.

It is an amenable number.

321690001 is a deficient number, since it is larger than the sum of its proper divisors (1).

321690001 is an equidigital number, since it uses as much as digits as its factorization.

321690001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 321690001 is about 17935.7185805309. The cubic root of 321690001 is about 685.1923739088.

The spelling of 321690001 in words is "three hundred twenty-one million, six hundred ninety thousand, one".