111621361 has 4 divisors (see below), whose sum is σ = 111643812. Its totient is φ = 111598912.

The previous prime is 111621331. The next prime is 111621373. The reversal of 111621361 is 163126111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19749136 + 91872225 = 4444^2 + 9585^2 .

It is a cyclic number.

It is not a de Polignac number, because 111621361 - 2⁵ = 111621329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111621331) 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, 76 + ... + 14941.

It is an arithmetic number, because the mean of its divisors is an integer number (27910953).

Almost surely, 2^111621361 is an apocalyptic number.

It is an amenable number.

111621361 is a deficient number, since it is larger than the sum of its proper divisors (22451).

111621361 is an equidigital number, since it uses as much as digits as its factorization.

111621361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22450.

The product of its digits is 216, while the sum is 22.

The square root of 111621361 is about 10565.1010880161. The cubic root of 111621361 is about 481.4846408269.

Adding to 111621361 its reverse (163126111), we get a palindrome (274747472).

The spelling of 111621361 in words is "one hundred eleven million, six hundred twenty-one thousand, three hundred sixty-one".