978111 has 12 divisors (see below), whose sum is σ = 1422720. Its totient is φ = 647520.

The previous prime is 978091. The next prime is 978113. The reversal of 978111 is 111879.

It is not a de Polignac number, because 978111 - 2⁵ = 978079 is a prime.

It is a super-2 number, since 2×978111² = 1913402256642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978113) 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, 1435 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (118560).

2⁹⁷⁸¹¹¹ is an apocalyptic number.

978111 is a deficient number, since it is larger than the sum of its proper divisors (444609).

978111 is a wasteful number, since it uses less digits than its factorization.

978111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 763 counting only the distinct ones).

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

The square root of 978111 is about 988.9949443753. The cubic root of 978111 is about 99.2649773200.

It can be divided in two parts, 978 and 111, that added together give a square (1089 = 33²).

The spelling of 978111 in words is "nine hundred seventy-eight thousand, one hundred eleven".