99855823 has 2 divisors, whose sum is σ = 99855824. Its totient is φ = 99855822.

The previous prime is 99855809. The next prime is 99855829. The reversal of 99855823 is 32855899.

It is a strong prime.

It is an emirp because it is prime and its reverse (32855899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99855823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99855829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49927911 + 49927912.

It is an arithmetic number, because the mean of its divisors is an integer number (49927912).

Almost surely, 2^99855823 is an apocalyptic number.

99855823 is a deficient number, since it is larger than the sum of its proper divisors (1).

99855823 is an equidigital number, since it uses as much as digits as its factorization.

99855823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 49.

The square root of 99855823 is about 9992.7885497493. The cubic root of 99855823 is about 463.9357059523.

The spelling of 99855823 in words is "ninety-nine million, eight hundred fifty-five thousand, eight hundred twenty-three".