321381979 has 4 divisors (see below), whose sum is σ = 338296840. Its totient is φ = 304467120.

The previous prime is 321381959. The next prime is 321382007. The reversal of 321381979 is 979183123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979183123 = 2539 ⋅385657.

It is a cyclic number.

It is not a de Polignac number, because 321381979 - 2⁵ = 321381947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321381959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8457402 + ... + 8457439.

It is an arithmetic number, because the mean of its divisors is an integer number (84574210).

Almost surely, 2^321381979 is an apocalyptic number.

321381979 is a deficient number, since it is larger than the sum of its proper divisors (16914861).

321381979 is a wasteful number, since it uses less digits than its factorization.

321381979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16914860.

The product of its digits is 81648, while the sum is 43.

The square root of 321381979 is about 17927.1296921733. The cubic root of 321381979 is about 684.9736107901.

The spelling of 321381979 in words is "three hundred twenty-one million, three hundred eighty-one thousand, nine hundred seventy-nine".