111668513 has 4 divisors (see below), whose sum is σ = 121820208. Its totient is φ = 101516820.

The previous prime is 111668489. The next prime is 111668527. The reversal of 111668513 is 315866111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315866111 = 11 ⋅28715101.

It is a cyclic number.

It is not a de Polignac number, because 111668513 - 2¹² = 111664417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111668513.

It is not an unprimeable number, because it can be changed into a prime (111668413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5075831 + ... + 5075852.

It is an arithmetic number, because the mean of its divisors is an integer number (30455052).

Almost surely, 2^111668513 is an apocalyptic number.

It is an amenable number.

111668513 is a deficient number, since it is larger than the sum of its proper divisors (10151695).

111668513 is a wasteful number, since it uses less digits than its factorization.

111668513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10151694.

The product of its digits is 4320, while the sum is 32.

The square root of 111668513 is about 10567.3323502197. The cubic root of 111668513 is about 481.5524288307.

The spelling of 111668513 in words is "one hundred eleven million, six hundred sixty-eight thousand, five hundred thirteen".