718891 has 4 divisors (see below), whose sum is σ = 721152. Its totient is φ = 716632.

The previous prime is 718871. The next prime is 718897. The reversal of 718891 is 198817.

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 718891 - 2⁹ = 718379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718897) 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, 556 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (180288).

2⁷¹⁸⁸⁹¹ is an apocalyptic number.

718891 is a deficient number, since it is larger than the sum of its proper divisors (2261).

718891 is a wasteful number, since it uses less digits than its factorization.

718891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260.

The product of its digits is 4032, while the sum is 34.

The square root of 718891 is about 847.8744010760. The cubic root of 718891 is about 89.5820538968.

The spelling of 718891 in words is "seven hundred eighteen thousand, eight hundred ninety-one".