815123243 has 16 divisors (see below), whose sum is σ = 930617856. Its totient is φ = 706717440.

The previous prime is 815123233. The next prime is 815123249. The reversal of 815123243 is 342321518.

It is a happy number.

815123243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-815123243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815123249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84746 + ... + 93872.

It is an arithmetic number, because the mean of its divisors is an integer number (58163616).

Almost surely, 2^815123243 is an apocalyptic number.

815123243 is a deficient number, since it is larger than the sum of its proper divisors (115494613).

815123243 is a wasteful number, since it uses less digits than its factorization.

815123243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9514.

The product of its digits is 5760, while the sum is 29.

The square root of 815123243 is about 28550.3632726451. The cubic root of 815123243 is about 934.1309446118.

The spelling of 815123243 in words is "eight hundred fifteen million, one hundred twenty-three thousand, two hundred forty-three".