811550122 has 4 divisors (see below), whose sum is σ = 1217325186. Its totient is φ = 405775060.

The previous prime is 811550111. The next prime is 811550143. The reversal of 811550122 is 221055118.

811550122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221055118 = 2 ⋅110527559.

It can be written as a sum of positive squares in only one way, i.e., 707081281 + 104468841 = 26591^2 + 10221^2 .

It is a super-2 number, since 2×811550122² = 1317227201036429768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202887529 + ... + 202887532.

Almost surely, 2^811550122 is an apocalyptic number.

811550122 is a deficient number, since it is larger than the sum of its proper divisors (405775064).

811550122 is a wasteful number, since it uses less digits than its factorization.

811550122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405775063.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 811550122 is about 28487.7187924902. The cubic root of 811550122 is about 932.7640135364.

The spelling of 811550122 in words is "eight hundred eleven million, five hundred fifty thousand, one hundred twenty-two".