321164905 has 4 divisors (see below), whose sum is σ = 385397892. Its totient is φ = 256931920.

The previous prime is 321164897. The next prime is 321164911. The reversal of 321164905 is 509461123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130393561 + 190771344 = 11419^2 + 13812^2 .

It is not a de Polignac number, because 321164905 - 2³ = 321164897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 32116486 + ... + 32116495.

It is an arithmetic number, because the mean of its divisors is an integer number (96349473).

Almost surely, 2^321164905 is an apocalyptic number.

It is an amenable number.

321164905 is a deficient number, since it is larger than the sum of its proper divisors (64232987).

321164905 is an equidigital number, since it uses as much as digits as its factorization.

321164905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64232986.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 321164905 is about 17921.0743260553. The cubic root of 321164905 is about 684.8193567032.

The spelling of 321164905 in words is "three hundred twenty-one million, one hundred sixty-four thousand, nine hundred five".