1320043111 has 16 divisors (see below), whose sum is σ = 1381295520. Its totient is φ = 1260443520.

The previous prime is 1320043051. The next prime is 1320043133. The reversal of 1320043111 is 1113400231.

It is not a de Polignac number, because 1320043111 - 2¹⁷ = 1319912039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320043171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452325 + ... + 455233.

It is an arithmetic number, because the mean of its divisors is an integer number (86330970).

Almost surely, 2^1320043111 is an apocalyptic number.

1320043111 is a deficient number, since it is larger than the sum of its proper divisors (61252409).

1320043111 is a wasteful number, since it uses less digits than its factorization.

1320043111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1320043111 is about 36332.3975399367. The cubic root of 1320043111 is about 1096.9732525532.

Adding to 1320043111 its reverse (1113400231), we get a palindrome (2433443342).

The spelling of 1320043111 in words is "one billion, three hundred twenty million, forty-three thousand, one hundred eleven".