99547909 has 2 divisors, whose sum is σ = 99547910. Its totient is φ = 99547908.

The previous prime is 99547907. The next prime is 99547949. The reversal of 99547909 is 90974599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 28196100 = 8447^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 99547909 - 2¹ = 99547907 is a prime.

Together with 99547907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99547907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49773954 + 49773955.

It is an arithmetic number, because the mean of its divisors is an integer number (49773955).

Almost surely, 2^99547909 is an apocalyptic number.

It is an amenable number.

99547909 is a deficient number, since it is larger than the sum of its proper divisors (1).

99547909 is an equidigital number, since it uses as much as digits as its factorization.

99547909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 99547909 is about 9977.3698438015. The cubic root of 99547909 is about 463.4583531078.

The spelling of 99547909 in words is "ninety-nine million, five hundred forty-seven thousand, nine hundred nine".