111678913 has 18 divisors (see below), whose sum is σ = 120098706. Its totient is φ = 103832064.

The previous prime is 111678911. The next prime is 111678929. The reversal of 111678913 is 319876111.

It can be written as a sum of positive squares in 9 ways, for example, as 418609 + 111260304 = 647^2 + 10548^2 .

It is not a de Polignac number, because 111678913 - 2¹ = 111678911 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111678911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1151281 + ... + 1151377.

Almost surely, 2^111678913 is an apocalyptic number.

It is an amenable number.

111678913 is a deficient number, since it is larger than the sum of its proper divisors (8419793).

111678913 is an frugal number, since it uses more digits than its factorization.

111678913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 163 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 111678913 is about 10567.8244213272. The cubic root of 111678913 is about 481.5673778068.

The spelling of 111678913 in words is "one hundred eleven million, six hundred seventy-eight thousand, nine hundred thirteen".