111311121545 has 16 divisors (see below), whose sum is σ = 146908823040. Its totient is φ = 80450065344.

The previous prime is 111311121533. The next prime is 111311121547. The reversal of 111311121545 is 545121113111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111311121545 - 2⁴ = 111311121529 is a prime.

It is a Curzon number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18214805 + ... + 18220914.

It is an arithmetic number, because the mean of its divisors is an integer number (9181801440).

Almost surely, 2^111311121545 is an apocalyptic number.

It is an amenable number.

111311121545 is a deficient number, since it is larger than the sum of its proper divisors (35597701495).

111311121545 is a wasteful number, since it uses less digits than its factorization.

111311121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36435784.

The product of its digits is 600, while the sum is 26.

Adding to 111311121545 its reverse (545121113111), we get a palindrome (656432234656).

The spelling of 111311121545 in words is "one hundred eleven billion, three hundred eleven million, one hundred twenty-one thousand, five hundred forty-five".