811111988 has 12 divisors (see below), whose sum is σ = 1424844960. Its totient is φ = 404013432.

The previous prime is 811111949. The next prime is 811112011. The reversal of 811111988 is 889111118.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384458 + ... + 386561.

It is an arithmetic number, because the mean of its divisors is an integer number (118737080).

Almost surely, 2^811111988 is an apocalyptic number.

It is an amenable number.

811111988 is a deficient number, since it is larger than the sum of its proper divisors (613732972).

811111988 is a wasteful number, since it uses less digits than its factorization.

811111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771286 (or 771284 counting only the distinct ones).

The product of its digits is 4608, while the sum is 38.

The square root of 811111988 is about 28480.0278791998. The cubic root of 811111988 is about 932.5961252842.

The spelling of 811111988 in words is "eight hundred eleven million, one hundred eleven thousand, nine hundred eighty-eight".