99501509 has 2 divisors, whose sum is σ = 99501510. Its totient is φ = 99501508.

The previous prime is 99501503. The next prime is 99501529. The reversal of 99501509 is 90510599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81396484 + 18105025 = 9022^2 + 4255^2 .

It is an emirp because it is prime and its reverse (90510599) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99501509 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 (99501503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49750754 + 49750755.

It is an arithmetic number, because the mean of its divisors is an integer number (49750755).

Almost surely, 2^99501509 is an apocalyptic number.

It is an amenable number.

99501509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99501509 is an equidigital number, since it uses as much as digits as its factorization.

99501509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18225, while the sum is 38.

The square root of 99501509 is about 9975.0443106785. The cubic root of 99501509 is about 463.3863348210.

The spelling of 99501509 in words is "ninety-nine million, five hundred one thousand, five hundred nine".