823115477 has 2 divisors, whose sum is σ = 823115478. Its totient is φ = 823115476.

The previous prime is 823115459. The next prime is 823115479. The reversal of 823115477 is 774511328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822485041 + 630436 = 28679^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 823115477 - 2⁶ = 823115413 is a prime.

Together with 823115479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 823115477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823115479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411557738 + 411557739.

It is an arithmetic number, because the mean of its divisors is an integer number (411557739).

Almost surely, 2^823115477 is an apocalyptic number.

It is an amenable number.

823115477 is a deficient number, since it is larger than the sum of its proper divisors (1).

823115477 is an equidigital number, since it uses as much as digits as its factorization.

823115477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 823115477 is about 28689.9891425563. The cubic root of 823115477 is about 937.1740527806.

The spelling of 823115477 in words is "eight hundred twenty-three million, one hundred fifteen thousand, four hundred seventy-seven".