718981 has 4 divisors (see below), whose sum is σ = 761292. Its totient is φ = 676672.

The previous prime is 718973. The next prime is 718999. The reversal of 718981 is 189817.

718981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 370881 + 348100 = 609^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 718981 - 2³ = 718973 is a prime.

It is a super-2 number, since 2×718981² = 1033867356722, which contains 22 as substring.

It is a Duffinian number.

718981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718901) 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, 21130 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (190323).

2⁷¹⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

718981 is a deficient number, since it is larger than the sum of its proper divisors (42311).

718981 is a wasteful number, since it uses less digits than its factorization.

718981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42310.

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

The square root of 718981 is about 847.9274733136. The cubic root of 718981 is about 89.5857920844.

The spelling of 718981 in words is "seven hundred eighteen thousand, nine hundred eighty-one".