1311111100 has 36 divisors (see below), whose sum is σ = 3063968824. Its totient is φ = 484102080.

The previous prime is 1311111059. The next prime is 1311111101. The reversal of 1311111100 is 11111131.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311111101) 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 11 ways as a sum of consecutive naturals, for example, 502974 + ... + 505573.

Almost surely, 2^1311111100 is an apocalyptic number.

1311111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311111100 is an abundant number, since it is smaller than the sum of its proper divisors (1752857724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311111100 is a wasteful number, since it uses less digits than its factorization.

1311111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008574 (or 1008567 counting only the distinct ones).

The product of its (nonzero) digits is 3, while the sum is 10.

The square root of 1311111100 is about 36209.2681505716. The cubic root of 1311111100 is about 1094.4934445916.

Adding to 1311111100 its reverse (11111131), we get a palindrome (1322222231).

The spelling of 1311111100 in words is "one billion, three hundred eleven million, one hundred eleven thousand, one hundred".