981111 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 612480.

The previous prime is 981091. The next prime is 981133. The reversal of 981111 is 111189.

It is not a de Polignac number, because 981111 - 2⁹ = 980599 is a prime.

981111 is a modest number, since divided by 1111 gives 98 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3951 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁹⁸¹¹¹¹ is an apocalyptic number.

981111 is a deficient number, since it is larger than the sum of its proper divisors (412809).

981111 is a wasteful number, since it uses less digits than its factorization.

981111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 72, while the sum is 21.

The square root of 981111 is about 990.5104744524. The cubic root of 981111 is about 99.3663601523.

The spelling of 981111 in words is "nine hundred eighty-one thousand, one hundred eleven".