99638213 has 2 divisors, whose sum is σ = 99638214. Its totient is φ = 99638212.

The previous prime is 99638191. The next prime is 99638219. The reversal of 99638213 is 31283699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87928129 + 11710084 = 9377^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 99638213 - 2²⁰ = 98589637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99638219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49819106 + 49819107.

It is an arithmetic number, because the mean of its divisors is an integer number (49819107).

Almost surely, 2^99638213 is an apocalyptic number.

It is an amenable number.

99638213 is a deficient number, since it is larger than the sum of its proper divisors (1).

99638213 is an equidigital number, since it uses as much as digits as its factorization.

99638213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 99638213 is about 9981.8942591073. The cubic root of 99638213 is about 463.5984514606.

The spelling of 99638213 in words is "ninety-nine million, six hundred thirty-eight thousand, two hundred thirteen".