99876509 has 2 divisors, whose sum is σ = 99876510. Its totient is φ = 99876508.

The previous prime is 99876503. The next prime is 99876527. The reversal of 99876509 is 90567899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94517284 + 5359225 = 9722^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 99876509 - 2¹² = 99872413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99876503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49938254 + 49938255.

It is an arithmetic number, because the mean of its divisors is an integer number (49938255).

Almost surely, 2^99876509 is an apocalyptic number.

It is an amenable number.

99876509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99876509 is an equidigital number, since it uses as much as digits as its factorization.

99876509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 99876509 is about 9993.8235425687. The cubic root of 99876509 is about 463.9677398424.

The spelling of 99876509 in words is "ninety-nine million, eight hundred seventy-six thousand, five hundred nine".