321117891 has 8 divisors (see below), whose sum is σ = 428246544. Its totient is φ = 214033920.

The previous prime is 321117889. The next prime is 321117989. The reversal of 321117891 is 198711123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 321117891 - 2¹ = 321117889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321117091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13195 + ... + 28571.

It is an arithmetic number, because the mean of its divisors is an integer number (53530818).

Almost surely, 2^321117891 is an apocalyptic number.

321117891 is a deficient number, since it is larger than the sum of its proper divisors (107128653).

321117891 is a wasteful number, since it uses less digits than its factorization.

321117891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22341.

The product of its digits is 3024, while the sum is 33.

The square root of 321117891 is about 17919.7625821326. The cubic root of 321117891 is about 684.7859391163.

The spelling of 321117891 in words is "three hundred twenty-one million, one hundred seventeen thousand, eight hundred ninety-one".