718319321 has 8 divisors (see below), whose sum is σ = 746045184. Its totient is φ = 690878160.

The previous prime is 718319317. The next prime is 718319333. The reversal of 718319321 is 123913817.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 718319321 - 2² = 718319317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718319621) 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, 66026 + ... + 76131.

It is an arithmetic number, because the mean of its divisors is an integer number (93255648).

Almost surely, 2^718319321 is an apocalyptic number.

It is an amenable number.

718319321 is a deficient number, since it is larger than the sum of its proper divisors (27725863).

718319321 is a wasteful number, since it uses less digits than its factorization.

718319321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142351.

The product of its digits is 9072, while the sum is 35.

The square root of 718319321 is about 26801.4798285468. The cubic root of 718319321 is about 895.5830168210.

The spelling of 718319321 in words is "seven hundred eighteen million, three hundred nineteen thousand, three hundred twenty-one".