111685961 has 4 divisors (see below), whose sum is σ = 111728400. Its totient is φ = 111643524.

The previous prime is 111685957. The next prime is 111685991. The reversal of 111685961 is 169586111.

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 111685961 - 2² = 111685957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111685991) 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 3 ways as a sum of consecutive naturals, for example, 16991 + ... + 22628.

It is an arithmetic number, because the mean of its divisors is an integer number (27932100).

Almost surely, 2^111685961 is an apocalyptic number.

It is an amenable number.

111685961 is a deficient number, since it is larger than the sum of its proper divisors (42439).

111685961 is an equidigital number, since it uses as much as digits as its factorization.

111685961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42438.

The product of its digits is 12960, while the sum is 38.

The square root of 111685961 is about 10568.1578811068. The cubic root of 111685961 is about 481.5775080853.

The spelling of 111685961 in words is "one hundred eleven million, six hundred eighty-five thousand, nine hundred sixty-one".