810165122 has 16 divisors (see below), whose sum is σ = 1309565880. Its totient is φ = 373683072.

The previous prime is 810165119. The next prime is 810165127. The reversal of 810165122 is 221561018.

It can be written as a sum of positive squares in 4 ways, for example, as 483604081 + 326561041 = 21991^2 + 18071^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 810165091 and 810165100.

It is not an unprimeable number, because it can be changed into a prime (810165127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35318 + ... + 53550.

Almost surely, 2^810165122 is an apocalyptic number.

810165122 is a deficient number, since it is larger than the sum of its proper divisors (499400758).

810165122 is a wasteful number, since it uses less digits than its factorization.

810165122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19957.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 810165122 is about 28463.3996915337. The cubic root of 810165122 is about 932.2330897597.

The spelling of 810165122 in words is "eight hundred ten million, one hundred sixty-five thousand, one hundred twenty-two".