111428459999 has 4 divisors (see below), whose sum is σ = 111429609936. Its totient is φ = 111427310064.

The previous prime is 111428459993. The next prime is 111428460001. The reversal of 111428459999 is 999954824111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111428459999 - 2²⁰ = 111427411423 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 (111428459993) 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, 414734 + ... + 628379.

It is an arithmetic number, because the mean of its divisors is an integer number (27857402484).

Almost surely, 2^111428459999 is an apocalyptic number.

111428459999 is a deficient number, since it is larger than the sum of its proper divisors (1149937).

111428459999 is a wasteful number, since it uses less digits than its factorization.

111428459999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149936.

The product of its digits is 8398080, while the sum is 62.

The spelling of 111428459999 in words is "one hundred eleven billion, four hundred twenty-eight million, four hundred fifty-nine thousand, nine hundred ninety-nine".