111792721 has 4 divisors (see below), whose sum is σ = 112084992. Its totient is φ = 111500452.

The previous prime is 111792679. The next prime is 111792749. The reversal of 111792721 is 127297111.

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 111792721 - 2¹³ = 111784529 is a prime.

It is a super-2 number, since 2×111792721² = 24995224937167682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111795721) 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, 145561 + ... + 146326.

It is an arithmetic number, because the mean of its divisors is an integer number (28021248).

Almost surely, 2^111792721 is an apocalyptic number.

It is an amenable number.

111792721 is a deficient number, since it is larger than the sum of its proper divisors (292271).

111792721 is an equidigital number, since it uses as much as digits as its factorization.

111792721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292270.

The product of its digits is 1764, while the sum is 31.

The square root of 111792721 is about 10573.2076968156. The cubic root of 111792721 is about 481.7309049884.

The spelling of 111792721 in words is "one hundred eleven million, seven hundred ninety-two thousand, seven hundred twenty-one".