111399961 has 4 divisors (see below), whose sum is σ = 111428352. Its totient is φ = 111371572.

The previous prime is 111399931. The next prime is 111399973. The reversal of 111399961 is 169993111.

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.

It is a cyclic number.

It is not a de Polignac number, because 111399961 - 2²⁵ = 77845529 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111399931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7141 + ... + 16546.

It is an arithmetic number, because the mean of its divisors is an integer number (27857088).

Almost surely, 2^111399961 is an apocalyptic number.

It is an amenable number.

111399961 is a deficient number, since it is larger than the sum of its proper divisors (28391).

111399961 is an equidigital number, since it uses as much as digits as its factorization.

111399961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28390.

The product of its digits is 13122, while the sum is 40.

The square root of 111399961 is about 10554.6179940346. The cubic root of 111399961 is about 481.1660899187.

The spelling of 111399961 in words is "one hundred eleven million, three hundred ninety-nine thousand, nine hundred sixty-one".