321381985 has 12 divisors (see below), whose sum is σ = 395304444. Its totient is φ = 250828160.

The previous prime is 321381959. The next prime is 321382007. The reversal of 321381985 is 589183123.

It can be written as a sum of positive squares in 6 ways, for example, as 111682624 + 209699361 = 10568^2 + 14481^2 .

It is not a de Polignac number, because 321381985 - 2²³ = 312993377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10714 + ... + 27523.

It is an arithmetic number, because the mean of its divisors is an integer number (32942037).

Almost surely, 2^321381985 is an apocalyptic number.

It is an amenable number.

321381985 is a deficient number, since it is larger than the sum of its proper divisors (73922459).

321381985 is an equidigital number, since it uses as much as digits as its factorization.

321381985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38324 (or 38283 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 321381985 is about 17927.1298595174. The cubic root of 321381985 is about 684.9736150528.

The spelling of 321381985 in words is "three hundred twenty-one million, three hundred eighty-one thousand, nine hundred eighty-five".