1331222111 has 4 divisors (see below), whose sum is σ = 1409529312. Its totient is φ = 1252914912.

The previous prime is 1331222033. The next prime is 1331222171. The reversal of 1331222111 is 1112221331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331222111 - 2²⁶ = 1264113247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 78307183 = 1331222111 / (1 + 3 + 3 + 1 + 2 + 2 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331222171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39153575 + ... + 39153608.

It is an arithmetic number, because the mean of its divisors is an integer number (352382328).

Almost surely, 2^1331222111 is an apocalyptic number.

1331222111 is a deficient number, since it is larger than the sum of its proper divisors (78307201).

1331222111 is an equidigital number, since it uses as much as digits as its factorization.

1331222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78307200.

The product of its digits is 72, while the sum is 17.

The square root of 1331222111 is about 36485.9166117558. The cubic root of 1331222111 is about 1100.0611842001.

Adding to 1331222111 its reverse (1112221331), we get a palindrome (2443443442).

The spelling of 1331222111 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, one hundred eleven".