99799813 has 2 divisors, whose sum is σ = 99799814. Its totient is φ = 99799812.

The previous prime is 99799789. The next prime is 99799849. The reversal of 99799813 is 31899799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73564929 + 26234884 = 8577^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 99799813 - 2¹⁷ = 99668741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99799853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49899906 + 49899907.

It is an arithmetic number, because the mean of its divisors is an integer number (49899907).

Almost surely, 2^99799813 is an apocalyptic number.

It is an amenable number.

99799813 is a deficient number, since it is larger than the sum of its proper divisors (1).

99799813 is an equidigital number, since it uses as much as digits as its factorization.

99799813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 55.

The square root of 99799813 is about 9989.9856356253. The cubic root of 99799813 is about 463.8489478710.

The spelling of 99799813 in words is "ninety-nine million, seven hundred ninety-nine thousand, eight hundred thirteen".