111531263121 has 8 divisors (see below), whose sum is σ = 165231500960. Its totient is φ = 74354175396.

The previous prime is 111531263113. The next prime is 111531263159. The reversal of 111531263121 is 121362135111.

111531263121 is a `hidden beast` number, since 1 + 1 + 1 + 5 + 3 + 1 + 2 + 631 + 21 = 666.

It is not a de Polignac number, because 111531263121 - 2³ = 111531263113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4130787523 = 111531263121 / (1 + 1 + 1 + 5 + 3 + 1 + 2 + 6 + 3 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111531263171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065393735 + ... + 2065393788.

It is an arithmetic number, because the mean of its divisors is an integer number (20653937620).

Almost surely, 2^111531263121 is an apocalyptic number.

It is an amenable number.

111531263121 is a deficient number, since it is larger than the sum of its proper divisors (53700237839).

111531263121 is an equidigital number, since it uses as much as digits as its factorization.

111531263121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130787532 (or 4130787526 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

Adding to 111531263121 its reverse (121362135111), we get a palindrome (232893398232).

The spelling of 111531263121 in words is "one hundred eleven billion, five hundred thirty-one million, two hundred sixty-three thousand, one hundred twenty-one".