111921977917 has 4 divisors (see below), whose sum is σ = 111925224576. Its totient is φ = 111918731260.

The previous prime is 111921977891. The next prime is 111921977953. The reversal of 111921977917 is 719779129111.

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 a de Polignac number, because none of the positive numbers 2^k-111921977917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111921977957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571059 + ... + 1640752.

It is an arithmetic number, because the mean of its divisors is an integer number (27981306144).

Almost surely, 2^111921977917 is an apocalyptic number.

It is an amenable number.

111921977917 is a deficient number, since it is larger than the sum of its proper divisors (3246659).

111921977917 is an equidigital number, since it uses as much as digits as its factorization.

111921977917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246658.

The product of its digits is 500094, while the sum is 55.

The spelling of 111921977917 in words is "one hundred eleven billion, nine hundred twenty-one million, nine hundred seventy-seven thousand, nine hundred seventeen".