810020310123 has 4 divisors (see below), whose sum is σ = 1080027080168. Its totient is φ = 540013540080.

The previous prime is 810020310109. The next prime is 810020310131. The reversal of 810020310123 is 321013020018.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 810020310123 - 2¹⁰ = 810020309099 is a prime.

It is a super-2 number, since 2×810020310123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 810020310123.

It is not an unprimeable number, because it can be changed into a prime (810020310103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135003385018 + ... + 135003385023.

It is an arithmetic number, because the mean of its divisors is an integer number (270006770042).

Almost surely, 2^810020310123 is an apocalyptic number.

810020310123 is a deficient number, since it is larger than the sum of its proper divisors (270006770045).

810020310123 is a wasteful number, since it uses less digits than its factorization.

810020310123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270006770044.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 810020310123 in words is "eight hundred ten billion, twenty million, three hundred ten thousand, one hundred twenty-three".