1131111111 has 8 divisors (see below), whose sum is σ = 1624159600. Its totient is φ = 696068352.

The previous prime is 1131111101. The next prime is 1131111139. The reversal of 1131111111 is 1111111311.

1131111111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1131111111 - 2⁹ = 1131110599 is a prime.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a Duffinian number.

1131111111 is a modest number, since divided by 111111 gives 1131 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131111101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14501386 + ... + 14501463.

It is an arithmetic number, because the mean of its divisors is an integer number (203019950).

Almost surely, 2^1131111111 is an apocalyptic number.

1131111111 is a deficient number, since it is larger than the sum of its proper divisors (493048489).

1131111111 is a wasteful number, since it uses less digits than its factorization.

1131111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29002865.

The product of its digits is 3, while the sum is 12.

The square root of 1131111111 is about 33631.9953466933. The cubic root of 1131111111 is about 1041.9217152907.

Adding to 1131111111 its reverse (1111111311), we get a palindrome (2242222422).

It can be divided in two parts, 11311 and 11111, that multiplied together give a palindrome (125676521).

The spelling of 1131111111 in words is "one billion, one hundred thirty-one million, one hundred eleven thousand, one hundred eleven".