111678861 has 16 divisors (see below), whose sum is σ = 172969088. Its totient is φ = 62769600.

The previous prime is 111678859. The next prime is 111678877. The reversal of 111678861 is 168876111.

It is not a de Polignac number, because 111678861 - 2¹ = 111678859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111678761) 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, 42310 + ... + 44871.

It is an arithmetic number, because the mean of its divisors is an integer number (10810568).

Almost surely, 2^111678861 is an apocalyptic number.

It is an amenable number.

111678861 is a deficient number, since it is larger than the sum of its proper divisors (61290227).

111678861 is an equidigital number, since it uses as much as digits as its factorization.

111678861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87252.

The product of its digits is 16128, while the sum is 39.

The square root of 111678861 is about 10567.8219610287. The cubic root of 111678861 is about 481.5673030642.

The spelling of 111678861 in words is "one hundred eleven million, six hundred seventy-eight thousand, eight hundred sixty-one".