111331879261 has 4 divisors (see below), whose sum is σ = 111332978172. Its totient is φ = 111330780352.

The previous prime is 111331879223. The next prime is 111331879273. The reversal of 111331879261 is 162978133111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 95477292036 + 15854587225 = 308994^2 + 125915^2 .

It is a cyclic number.

It is not a de Polignac number, because 111331879261 - 2¹¹ = 111331877213 is a prime.

It is a super-2 number, since 2×111331879261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111331849261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380086 + ... + 605911.

It is an arithmetic number, because the mean of its divisors is an integer number (27833244543).

Almost surely, 2^111331879261 is an apocalyptic number.

It is an amenable number.

111331879261 is a deficient number, since it is larger than the sum of its proper divisors (1098911).

111331879261 is an equidigital number, since it uses as much as digits as its factorization.

111331879261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098910.

The product of its digits is 54432, while the sum is 43.

The spelling of 111331879261 in words is "one hundred eleven billion, three hundred thirty-one million, eight hundred seventy-nine thousand, two hundred sixty-one".