111715709121 has 27 divisors (see below), whose sum is σ = 165270918657. Its totient is φ = 72717036840.

The previous prime is 111715709101. The next prime is 111715709123. The reversal of 111715709121 is 121907517111.

The square root of 111715709121 is 334239.

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

111715709121 is a `hidden beast` number, since 1 + 1 + 1 + 71 + 570 + 9 + 12 + 1 = 666.

It is not a de Polignac number, because 111715709121 - 2¹⁵ = 111715676353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111715709123) 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, 43115536 + ... + 43118126.

Almost surely, 2^111715709121 is an apocalyptic number.

111715709121 is the 334239-th square number.

111715709121 is the 167120-th centered octagonal number.

It is an amenable number.

111715709121 is a deficient number, since it is larger than the sum of its proper divisors (53555209536).

111715709121 is an frugal number, since it uses more digits than its factorization.

111715709121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274 (or 2637 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 36.

Multiplying 111715709121 by its sum of digits (36), we get a square (4021765528356 = 2005434²).

It can be divided in two parts, 111715 and 709121, that added together give a square (820836 = 906²).

The spelling of 111715709121 in words is "one hundred eleven billion, seven hundred fifteen million, seven hundred nine thousand, one hundred twenty-one".