1331111111 has 8 divisors (see below), whose sum is σ = 1483017984. Its totient is φ = 1184353720.

The previous prime is 1331111099. The next prime is 1331111129. The reversal of 1331111111 is 1111111331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1331111111 - 2¹⁰ = 1331110087 is a prime.

It is a Duffinian number.

1331111111 is a modest number, since divided by 111111 gives 1331 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1286825 + ... + 1287858.

It is an arithmetic number, because the mean of its divisors is an integer number (185377248).

Almost surely, 2^1331111111 is an apocalyptic number.

1331111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331111111 is a deficient number, since it is larger than the sum of its proper divisors (151906873).

1331111111 is a wasteful number, since it uses less digits than its factorization.

1331111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574741.

The product of its digits is 9, while the sum is 14.

The square root of 1331111111 is about 36484.3954451763. The cubic root of 1331111111 is about 1100.0306082392.

Adding to 1331111111 its reverse (1111111331), we get a palindrome (2442222442).

It can be divided in two parts, 1331 and 111111, that multiplied together give a palindrome (147888741).

The spelling of 1331111111 in words is "one billion, three hundred thirty-one million, one hundred eleven thousand, one hundred eleven".