99820807 has 2 divisors, whose sum is σ = 99820808. Its totient is φ = 99820806.

The previous prime is 99820801. The next prime is 99820811. The reversal of 99820807 is 70802899.

It is a strong prime.

It is an emirp because it is prime and its reverse (70802899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99820807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99820801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49910403 + 49910404.

It is an arithmetic number, because the mean of its divisors is an integer number (49910404).

Almost surely, 2^99820807 is an apocalyptic number.

99820807 is a deficient number, since it is larger than the sum of its proper divisors (1).

99820807 is an equidigital number, since it uses as much as digits as its factorization.

99820807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 99820807 is about 9991.0363326334. The cubic root of 99820807 is about 463.8814708513.

The spelling of 99820807 in words is "ninety-nine million, eight hundred twenty thousand, eight hundred seven".