711981 has 12 divisors (see below), whose sum is σ = 1035840. Its totient is φ = 471240.

The previous prime is 711973. The next prime is 711983. The reversal of 711981 is 189117.

711981 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 711981 - 2³ = 711973 is a prime.

It is a super-2 number, since 2×711981² = 1013833888722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

711981 is strictly pandigital in base 7.

It is a zygodrome in base 3.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 711981.

It is not an unprimeable number, because it can be changed into a prime (711983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1986 + ... + 2316.

It is an arithmetic number, because the mean of its divisors is an integer number (86320).

2⁷¹¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

711981 is a deficient number, since it is larger than the sum of its proper divisors (323859).

711981 is a wasteful number, since it uses less digits than its factorization.

711981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 573 counting only the distinct ones).

The product of its digits is 504, while the sum is 27.

The square root of 711981 is about 843.7896657343. The cubic root of 711981 is about 89.2941076148.

The spelling of 711981 in words is "seven hundred eleven thousand, nine hundred eighty-one".