1331243111 has 16 divisors (see below), whose sum is σ = 1483027488. Its totient is φ = 1184832000.

The previous prime is 1331243107. The next prime is 1331243117. The reversal of 1331243111 is 1113421331.

It is not a de Polignac number, because 1331243111 - 2² = 1331243107 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 (1331243117) 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, 103961 + ... + 116061.

It is an arithmetic number, because the mean of its divisors is an integer number (92689218).

Almost surely, 2^1331243111 is an apocalyptic number.

1331243111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331243111 is a deficient number, since it is larger than the sum of its proper divisors (151784377).

1331243111 is a wasteful number, since it uses less digits than its factorization.

1331243111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12322.

The product of its digits is 216, while the sum is 20.

The square root of 1331243111 is about 36486.2043928935. The cubic root of 1331243111 is about 1100.0669686501.

Adding to 1331243111 its reverse (1113421331), we get a palindrome (2444664442).

It can be divided in two parts, 1331 and 243111, that added together give a palindrome (244442).

The spelling of 1331243111 in words is "one billion, three hundred thirty-one million, two hundred forty-three thousand, one hundred eleven".