823115563 has 2 divisors, whose sum is σ = 823115564. Its totient is φ = 823115562.

The previous prime is 823115533. The next prime is 823115593. The reversal of 823115563 is 365511328.

It is a balanced prime because it is at equal distance from previous prime (823115533) and next prime (823115593).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823115563 is a prime.

It is not a weakly prime, because it can be changed into another prime (823115533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411557781 + 411557782.

It is an arithmetic number, because the mean of its divisors is an integer number (411557782).

Almost surely, 2^823115563 is an apocalyptic number.

823115563 is a deficient number, since it is larger than the sum of its proper divisors (1).

823115563 is an equidigital number, since it uses as much as digits as its factorization.

823115563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 823115563 is about 28689.9906413369. The cubic root of 823115563 is about 937.1740854196.

The spelling of 823115563 in words is "eight hundred twenty-three million, one hundred fifteen thousand, five hundred sixty-three".