111243522531 has 8 divisors (see below), whose sum is σ = 148341135040. Its totient is φ = 74154129192.

The previous prime is 111243522521. The next prime is 111243522581. The reversal of 111243522531 is 135225342111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111243522531 - 2¹⁷ = 111243391459 is a prime.

It is a super-2 number, since 2×111243522531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111243522521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023141 + ... + 2077398.

It is an arithmetic number, because the mean of its divisors is an integer number (18542641880).

Almost surely, 2^111243522531 is an apocalyptic number.

111243522531 is a deficient number, since it is larger than the sum of its proper divisors (37097612509).

111243522531 is an equidigital number, since it uses as much as digits as its factorization.

111243522531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109585.

The product of its digits is 7200, while the sum is 30.

Adding to 111243522531 its reverse (135225342111), we get a palindrome (246468864642).

The spelling of 111243522531 in words is "one hundred eleven billion, two hundred forty-three million, five hundred twenty-two thousand, five hundred thirty-one".