99477809 has 2 divisors, whose sum is σ = 99477810. Its totient is φ = 99477808.

The previous prime is 99477799. The next prime is 99477821. The reversal of 99477809 is 90877499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 47997184 = 7175^2 + 6928^2 .

It is an emirp because it is prime and its reverse (90877499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99477809 - 2¹² = 99473713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99477899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49738904 + 49738905.

It is an arithmetic number, because the mean of its divisors is an integer number (49738905).

Almost surely, 2^99477809 is an apocalyptic number.

It is an amenable number.

99477809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99477809 is an equidigital number, since it uses as much as digits as its factorization.

99477809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 99477809 is about 9973.8562752829. The cubic root of 99477809 is about 463.3495409797.

The spelling of 99477809 in words is "ninety-nine million, four hundred seventy-seven thousand, eight hundred nine".