811117220 has 24 divisors (see below), whose sum is σ = 1792996800. Its totient is φ = 307370592.

The previous prime is 811117207. The next prime is 811117259. The reversal of 811117220 is 22711118.

It is a super-2 number, since 2×811117220² = 1315822289161056800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066880 + ... + 1067639.

It is an arithmetic number, because the mean of its divisors is an integer number (74708200).

Almost surely, 2^811117220 is an apocalyptic number.

It is an amenable number.

811117220 is an abundant number, since it is smaller than the sum of its proper divisors (981879580).

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

811117220 is a wasteful number, since it uses less digits than its factorization.

811117220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134547 (or 2134545 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 811117220 is about 28480.1197328944. The cubic root of 811117220 is about 932.5981304872.

Adding to 811117220 its reverse (22711118), we get a palindrome (833828338).

The spelling of 811117220 in words is "eight hundred eleven million, one hundred seventeen thousand, two hundred twenty".