111969433196721 has 15 divisors (see below), whose sum is σ = 167263122717691. Its totient is φ = 74646225308448.

The previous prime is 111969433196711. The next prime is 111969433196737. The reversal of 111969433196721 is 127691334969111.

The square root of 111969433196721 is 10581561.

It is a perfect power (a square), and thus also a powerful number.

111969433196721 is a `hidden beast` number, since 1 + 1 + 1 + 9 + 6 + 9 + 433 + 196 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 260599019121 + 111708834177600 = 510489^2 + 10569240^2 .

It is not a de Polignac number, because 111969433196721 - 2⁹ = 111969433196209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111969433196711) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 94646185 + ... + 95821913.

Almost surely, 2^{111969433196721} is an apocalyptic number.

111969433196721 is the 10581561-st square number.

111969433196721 is the 5290781-st centered octagonal number.

It is an amenable number.

111969433196721 is a deficient number, since it is larger than the sum of its proper divisors (55293689520970).

111969433196721 is an frugal number, since it uses more digits than its factorization.

111969433196721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351470 (or 1175732 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The spelling of 111969433196721 in words is "one hundred eleven trillion, nine hundred sixty-nine billion, four hundred thirty-three million, one hundred ninety-six thousand, seven hundred twenty-one".