823111047 has 24 divisors (see below), whose sum is σ = 1324627200. Its totient is φ = 488238480.

The previous prime is 823111021. The next prime is 823111087. The reversal of 823111047 is 740111328.

It is not a de Polignac number, because 823111047 - 2⁶ = 823110983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 823111047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823111087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83797 + ... + 93102.

It is an arithmetic number, because the mean of its divisors is an integer number (55192800).

Almost surely, 2^823111047 is an apocalyptic number.

823111047 is a deficient number, since it is larger than the sum of its proper divisors (501516153).

823111047 is a wasteful number, since it uses less digits than its factorization.

823111047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176963 (or 176960 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 823111047 is about 28689.9119378223. The cubic root of 823111047 is about 937.1723714902.

The spelling of 823111047 in words is "eight hundred twenty-three million, one hundred eleven thousand, forty-seven".