99640873 has 2 divisors, whose sum is σ = 99640874. Its totient is φ = 99640872.

The previous prime is 99640831. The next prime is 99640909. The reversal of 99640873 is 37804699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90478144 + 9162729 = 9512^2 + 3027^2 .

It is a cyclic number.

It is not a de Polignac number, because 99640873 - 2¹³ = 99632681 is a prime.

It is not a weakly prime, because it can be changed into another prime (99640813) 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, 49820436 + 49820437.

It is an arithmetic number, because the mean of its divisors is an integer number (49820437).

Almost surely, 2^99640873 is an apocalyptic number.

It is an amenable number.

99640873 is a deficient number, since it is larger than the sum of its proper divisors (1).

99640873 is an equidigital number, since it uses as much as digits as its factorization.

99640873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 99640873 is about 9982.0274994612. The cubic root of 99640873 is about 463.6025769223.

The spelling of 99640873 in words is "ninety-nine million, six hundred forty thousand, eight hundred seventy-three".