111413521 has 4 divisors (see below), whose sum is σ = 112562212. Its totient is φ = 110264832.

The previous prime is 111413501. The next prime is 111413527. The reversal of 111413521 is 125314111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125314111 = 13 ⋅9639547.

It can be written as a sum of positive squares in 2 ways, for example, as 64641600 + 46771921 = 8040^2 + 6839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111413521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111413527) 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, 574200 + ... + 574393.

It is an arithmetic number, because the mean of its divisors is an integer number (28140553).

Almost surely, 2^111413521 is an apocalyptic number.

It is an amenable number.

111413521 is a deficient number, since it is larger than the sum of its proper divisors (1148691).

111413521 is an equidigital number, since it uses as much as digits as its factorization.

111413521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148690.

The product of its digits is 120, while the sum is 19.

The square root of 111413521 is about 10555.2603473339. The cubic root of 111413521 is about 481.1856122100.

Adding to 111413521 its reverse (125314111), we get a palindrome (236727632).

The spelling of 111413521 in words is "one hundred eleven million, four hundred thirteen thousand, five hundred twenty-one".