1111871856 has 80 divisors (see below), whose sum is σ = 2942097408. Its totient is φ = 361670400.

The previous prime is 1111871843. The next prime is 1111871863. The reversal of 1111871856 is 6581781111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1220041 + ... + 1220951.

Almost surely, 2^1111871856 is an apocalyptic number.

1111871856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111871856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471048704).

1111871856 is an abundant number, since it is smaller than the sum of its proper divisors (1830225552).

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

1111871856 is a wasteful number, since it uses less digits than its factorization.

1111871856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1504 counting only the distinct ones).

The product of its digits is 13440, while the sum is 39.

The square root of 1111871856 is about 33344.7425541119. The cubic root of 1111871856 is about 1035.9804958488.

The spelling of 1111871856 in words is "one billion, one hundred eleven million, eight hundred seventy-one thousand, eight hundred fifty-six".