111998292009 has 4 divisors (see below), whose sum is σ = 149331056016. Its totient is φ = 74665528004.

The previous prime is 111998291959. The next prime is 111998292041. The reversal of 111998292009 is 900292899111.

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 111998292009 - 2²⁰ = 111997243433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111998292089) 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, 18666381999 + ... + 18666382004.

It is an arithmetic number, because the mean of its divisors is an integer number (37332764004).

Almost surely, 2^111998292009 is an apocalyptic number.

It is an amenable number.

111998292009 is a deficient number, since it is larger than the sum of its proper divisors (37332764007).

111998292009 is an equidigital number, since it uses as much as digits as its factorization.

111998292009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37332764006.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 111998292009 in words is "one hundred eleven billion, nine hundred ninety-eight million, two hundred ninety-two thousand, nine".