79851823 has 2 divisors, whose sum is σ = 79851824. Its totient is φ = 79851822.

The previous prime is 79851803. The next prime is 79851829. The reversal of 79851823 is 32815897.

It is a strong prime.

It is an emirp because it is prime and its reverse (32815897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79851823 - 2⁹ = 79851311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79851823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79851829) 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, 39925911 + 39925912.

It is an arithmetic number, because the mean of its divisors is an integer number (39925912).

Almost surely, 2^79851823 is an apocalyptic number.

79851823 is a deficient number, since it is larger than the sum of its proper divisors (1).

79851823 is an equidigital number, since it uses as much as digits as its factorization.

79851823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 79851823 is about 8935.9847246960. The cubic root of 79851823 is about 430.6207421974.

The spelling of 79851823 in words is "seventy-nine million, eight hundred fifty-one thousand, eight hundred twenty-three".