111541121 has 8 divisors (see below), whose sum is σ = 112518120. Its totient is φ = 110567808.

The previous prime is 111541043. The next prime is 111541139. The reversal of 111541121 is 121145111.

It can be written as a sum of positive squares in 4 ways, for example, as 33466225 + 78074896 = 5785^2 + 8836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 111541121 - 2¹⁸ = 111278977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111541121.

It is not an unprimeable number, because it can be changed into a prime (111541151) 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, 129725 + ... + 130581.

It is an arithmetic number, because the mean of its divisors is an integer number (14064765).

Almost surely, 2^111541121 is an apocalyptic number.

It is an amenable number.

111541121 is a deficient number, since it is larger than the sum of its proper divisors (976999).

111541121 is an equidigital number, since it uses as much as digits as its factorization.

111541121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843.

The product of its digits is 40, while the sum is 17.

The square root of 111541121 is about 10561.3029972632. The cubic root of 111541121 is about 481.3692400097.

Adding to 111541121 its reverse (121145111), we get a palindrome (232686232).

The spelling of 111541121 in words is "one hundred eleven million, five hundred forty-one thousand, one hundred twenty-one".