1115366219881 has 3 divisors (see below), whose sum is σ = 1115367275991. Its totient is φ = 1115365163772.

The previous prime is 1115366219867. The next prime is 1115366219887. The reversal of 1115366219881 is 1889126635111.

The square root of 1115366219881 is 1056109.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 209481051481 + 905885168400 = 457691^2 + 951780^2 .

It is not a de Polignac number, because 1115366219881 - 2¹³ = 1115366211689 is a prime.

It is a super-2 number, since 2×1115366219881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115366219887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 528055 + ... + 1584163.

It is an arithmetic number, because the mean of its divisors is an integer number (371789091997).

Almost surely, 2^{1115366219881} is an apocalyptic number.

1115366219881 is the 1056109-th square number.

1115366219881 is the 528055-th centered octagonal number.

It is an amenable number.

1115366219881 is a deficient number, since it is larger than the sum of its proper divisors (1056110).

1115366219881 is an frugal number, since it uses more digits than its factorization.

1115366219881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112218 (or 1056109 counting only the distinct ones).

The product of its digits is 622080, while the sum is 52.

The spelling of 1115366219881 in words is "one trillion, one hundred fifteen billion, three hundred sixty-six million, two hundred nineteen thousand, eight hundred eighty-one".