111116521 has 4 divisors (see below), whose sum is σ = 111852544. Its totient is φ = 110380500.

The previous prime is 111116497. The next prime is 111116527. The reversal of 111116521 is 125611111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125611111 = 1019 ⋅123269.

It is a cyclic number.

It is not a de Polignac number, because 111116521 - 2¹¹ = 111114473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111116527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367785 + ... + 368086.

It is an arithmetic number, because the mean of its divisors is an integer number (27963136).

Almost surely, 2^111116521 is an apocalyptic number.

It is an amenable number.

111116521 is a deficient number, since it is larger than the sum of its proper divisors (736023).

111116521 is an equidigital number, since it uses as much as digits as its factorization.

111116521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736022.

The product of its digits is 60, while the sum is 19.

The square root of 111116521 is about 10541.1821443328. The cubic root of 111116521 is about 480.7576590524.

Adding to 111116521 its reverse (125611111), we get a palindrome (236727632).

The spelling of 111116521 in words is "one hundred eleven million, one hundred sixteen thousand, five hundred twenty-one".