321982491 has 4 divisors (see below), whose sum is σ = 429309992. Its totient is φ = 214654992.

The previous prime is 321982393. The next prime is 321982501. The reversal of 321982491 is 194289123.

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

It is not a de Polignac number, because 321982491 - 2¹⁴ = 321966107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321982391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53663746 + ... + 53663751.

It is an arithmetic number, because the mean of its divisors is an integer number (107327498).

Almost surely, 2^321982491 is an apocalyptic number.

321982491 is a deficient number, since it is larger than the sum of its proper divisors (107327501).

321982491 is a wasteful number, since it uses less digits than its factorization.

321982491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107327500.

The product of its digits is 31104, while the sum is 39.

The square root of 321982491 is about 17943.8705690829. The cubic root of 321982491 is about 685.3999766809.

The spelling of 321982491 in words is "three hundred twenty-one million, nine hundred eighty-two thousand, four hundred ninety-one".