79821323 has 2 divisors, whose sum is σ = 79821324. Its totient is φ = 79821322.

The previous prime is 79821319. The next prime is 79821331. The reversal of 79821323 is 32312897.

It is a weak prime.

It is an emirp because it is prime and its reverse (32312897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79821323 - 2² = 79821319 is a prime.

It is not a weakly prime, because it can be changed into another prime (79821353) 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, 39910661 + 39910662.

It is an arithmetic number, because the mean of its divisors is an integer number (39910662).

Almost surely, 2^79821323 is an apocalyptic number.

79821323 is a deficient number, since it is larger than the sum of its proper divisors (1).

79821323 is an equidigital number, since it uses as much as digits as its factorization.

79821323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 79821323 is about 8934.2779786617. The cubic root of 79821323 is about 430.5659089462.

The spelling of 79821323 in words is "seventy-nine million, eight hundred twenty-one thousand, three hundred twenty-three".