111813121 has 4 divisors (see below), whose sum is σ = 127786432. Its totient is φ = 95839812.

The previous prime is 111813101. The next prime is 111813133. The reversal of 111813121 is 121318111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121318111 = 307 ⋅395173.

It is a cyclic number.

It is not a de Polignac number, because 111813121 - 2⁵ = 111813089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111813101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7986645 + ... + 7986658.

It is an arithmetic number, because the mean of its divisors is an integer number (31946608).

Almost surely, 2^111813121 is an apocalyptic number.

It is an amenable number.

111813121 is a deficient number, since it is larger than the sum of its proper divisors (15973311).

111813121 is an equidigital number, since it uses as much as digits as its factorization.

111813121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15973310.

The product of its digits is 48, while the sum is 19.

The square root of 111813121 is about 10574.1723553194. The cubic root of 111813121 is about 481.7602053837.

The spelling of 111813121 in words is "one hundred eleven million, eight hundred thirteen thousand, one hundred twenty-one".