321144891 has 4 divisors (see below), whose sum is σ = 428193192. Its totient is φ = 214096592.

The previous prime is 321144871. The next prime is 321144893. The reversal of 321144891 is 198441123.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 321144891 - 2⁹ = 321144379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321144893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53524146 + ... + 53524151.

It is an arithmetic number, because the mean of its divisors is an integer number (107048298).

Almost surely, 2^321144891 is an apocalyptic number.

321144891 is a deficient number, since it is larger than the sum of its proper divisors (107048301).

321144891 is a wasteful number, since it uses less digits than its factorization.

321144891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107048300.

The product of its digits is 6912, while the sum is 33.

The square root of 321144891 is about 17920.5159244928. The cubic root of 321144891 is about 684.8051311354.

The spelling of 321144891 in words is "three hundred twenty-one million, one hundred forty-four thousand, eight hundred ninety-one".