111311121543 has 16 divisors (see below), whose sum is σ = 149555328000. Its totient is φ = 73638128160.

The previous prime is 111311121533. The next prime is 111311121547. The reversal of 111311121543 is 345121113111.

It is a happy number.

It is not a de Polignac number, because 111311121543 - 2⁶ = 111311121479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111311121547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344598 + ... + 584268.

It is an arithmetic number, because the mean of its divisors is an integer number (9347208000).

Almost surely, 2^111311121543 is an apocalyptic number.

111311121543 is a deficient number, since it is larger than the sum of its proper divisors (38244206457).

111311121543 is a wasteful number, since it uses less digits than its factorization.

111311121543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240862.

The product of its digits is 360, while the sum is 24.

Adding to 111311121543 its reverse (345121113111), we get a palindrome (456432234654).

The spelling of 111311121543 in words is "one hundred eleven billion, three hundred eleven million, one hundred twenty-one thousand, five hundred forty-three".