111520013531 has 4 divisors (see below), whose sum is σ = 111626123064. Its totient is φ = 111413904000.

The previous prime is 111520013513. The next prime is 111520013533. The reversal of 111520013531 is 135310025111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111520013531 - 2²² = 111515819227 is a prime.

It is a super-3 number, since 3×111520013531³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111520013497 and 111520013506.

It is not an unprimeable number, because it can be changed into a prime (111520013533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53053190 + ... + 53055291.

It is an arithmetic number, because the mean of its divisors is an integer number (27906530766).

Almost surely, 2^111520013531 is an apocalyptic number.

111520013531 is a deficient number, since it is larger than the sum of its proper divisors (106109533).

111520013531 is a wasteful number, since it uses less digits than its factorization.

111520013531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106109532.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 111520013531 its reverse (135310025111), we get a palindrome (246830038642).

The spelling of 111520013531 in words is "one hundred eleven billion, five hundred twenty million, thirteen thousand, five hundred thirty-one".