111534721 has 9 divisors (see below), whose sum is σ = 114094561. Its totient is φ = 109031764.

The previous prime is 111534707. The next prime is 111534727. The reversal of 111534721 is 127435111.

The square root of 111534721 is 10561.

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

It is not a de Polignac number, because 111534721 - 2⁷ = 111534593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111534727) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 623010 + ... + 623188.

Almost surely, 2^111534721 is an apocalyptic number.

111534721 is the 10561-st square number.

111534721 is the 5281-st centered octagonal number.

It is an amenable number.

111534721 is a deficient number, since it is larger than the sum of its proper divisors (2559840).

111534721 is an frugal number, since it uses more digits than its factorization.

111534721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 238 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The cubic root of 111534721 is about 481.3600331748.

Multiplying 111534721 by its sum of digits (25), we get a square (2788368025 = 52805²).

Adding to 111534721 its reverse (127435111), we get a palindrome (238969832).

The spelling of 111534721 in words is "one hundred eleven million, five hundred thirty-four thousand, seven hundred twenty-one".