99765509 has 2 divisors, whose sum is σ = 99765510. Its totient is φ = 99765508.

The previous prime is 99765499. The next prime is 99765521. The reversal of 99765509 is 90556799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73530625 + 26234884 = 8575^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 99765509 - 2²⁴ = 82988293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99765109) 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, 49882754 + 49882755.

It is an arithmetic number, because the mean of its divisors is an integer number (49882755).

Almost surely, 2^99765509 is an apocalyptic number.

It is an amenable number.

99765509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99765509 is an equidigital number, since it uses as much as digits as its factorization.

99765509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 765450, while the sum is 50.

The square root of 99765509 is about 9988.2685686760. The cubic root of 99765509 is about 463.7957958083.

The spelling of 99765509 in words is "ninety-nine million, seven hundred sixty-five thousand, five hundred nine".