823179449 has 2 divisors, whose sum is σ = 823179450. Its totient is φ = 823179448.

The previous prime is 823179437. The next prime is 823179451. The reversal of 823179449 is 944971328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684764224 + 138415225 = 26168^2 + 11765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823179449 is a prime.

Together with 823179451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (823179419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411589724 + 411589725.

It is an arithmetic number, because the mean of its divisors is an integer number (411589725).

Almost surely, 2^823179449 is an apocalyptic number.

It is an amenable number.

823179449 is a deficient number, since it is larger than the sum of its proper divisors (1).

823179449 is an equidigital number, since it uses as much as digits as its factorization.

823179449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 823179449 is about 28691.1040045517. The cubic root of 823179449 is about 937.1983310045.

The spelling of 823179449 in words is "eight hundred twenty-three million, one hundred seventy-nine thousand, four hundred forty-nine".