99785009 has 2 divisors, whose sum is σ = 99785010. Its totient is φ = 99785008.

The previous prime is 99785003. The next prime is 99785011. The reversal of 99785009 is 90058799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52243984 + 47541025 = 7228^2 + 6895^2 .

It is a cyclic number.

It is not a de Polignac number, because 99785009 - 2²⁰ = 98736433 is a prime.

It is a super-2 number, since 2×99785009² = 19914096042260162, which contains 22 as substring.

Together with 99785011, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (99785003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49892504 + 49892505.

It is an arithmetic number, because the mean of its divisors is an integer number (49892505).

Almost surely, 2^99785009 is an apocalyptic number.

It is an amenable number.

99785009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99785009 is an equidigital number, since it uses as much as digits as its factorization.

99785009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 99785009 is about 9989.2446661397. The cubic root of 99785009 is about 463.8260114240.

The spelling of 99785009 in words is "ninety-nine million, seven hundred eighty-five thousand, nine".