111596751721 has 27 divisors (see below), whose sum is σ = 140608972503. Its totient is φ = 88272278640.

The previous prime is 111596751683. The next prime is 111596751793. The reversal of 111596751721 is 127157695111.

The square root of 111596751721 is 334061.

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

It can be written as a sum of positive squares in only one way, i.e., 16508395225 + 95088356496 = 128485^2 + 308364^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111596751721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111596781721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 30397716 + ... + 30401386.

Almost surely, 2^111596751721 is an apocalyptic number.

111596751721 is the 334061-st square number.

111596751721 is the 167031-st centered octagonal number.

It is an amenable number.

111596751721 is a deficient number, since it is larger than the sum of its proper divisors (29012220782).

111596751721 is an frugal number, since it uses more digits than its factorization.

111596751721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382 (or 3691 counting only the distinct ones).

The product of its digits is 132300, while the sum is 46.

The spelling of 111596751721 in words is "one hundred eleven billion, five hundred ninety-six million, seven hundred fifty-one thousand, seven hundred twenty-one".