111571320361 has 4 divisors (see below), whose sum is σ = 115418607300. Its totient is φ = 107724033424.

The previous prime is 111571320253. The next prime is 111571320401. The reversal of 111571320361 is 163023175111.

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 21030510361 + 90540810000 = 145019^2 + 300900^2 .

It is a cyclic number.

It is not a de Polignac number, because 111571320361 - 2²¹ = 111569223209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111571320461) 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, 1923643426 + ... + 1923643483.

It is an arithmetic number, because the mean of its divisors is an integer number (28854651825).

Almost surely, 2^111571320361 is an apocalyptic number.

It is an amenable number.

111571320361 is a deficient number, since it is larger than the sum of its proper divisors (3847286939).

111571320361 is an equidigital number, since it uses as much as digits as its factorization.

111571320361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847286938.

The product of its (nonzero) digits is 3780, while the sum is 31.

Adding to 111571320361 its reverse (163023175111), we get a palindrome (274594495472).

The spelling of 111571320361 in words is "one hundred eleven billion, five hundred seventy-one million, three hundred twenty thousand, three hundred sixty-one".