99475909 has 4 divisors (see below), whose sum is σ = 107127916. Its totient is φ = 91823904.

The previous prime is 99475889. The next prime is 99475913. The reversal of 99475909 is 90957499.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57912100 + 41563809 = 7610^2 + 6447^2 .

It is a cyclic number.

It is not a de Polignac number, because 99475909 - 2⁷ = 99475781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99475939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3825984 + ... + 3826009.

It is an arithmetic number, because the mean of its divisors is an integer number (26781979).

Almost surely, 2^99475909 is an apocalyptic number.

It is an amenable number.

99475909 is a deficient number, since it is larger than the sum of its proper divisors (7652007).

99475909 is a wasteful number, since it uses less digits than its factorization.

99475909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7652006.

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

The square root of 99475909 is about 9973.7610258117. The cubic root of 99475909 is about 463.3465910094.

The spelling of 99475909 in words is "ninety-nine million, four hundred seventy-five thousand, nine hundred nine".