99426809 has 2 divisors, whose sum is σ = 99426810. Its totient is φ = 99426808.

The previous prime is 99426797. The next prime is 99426823. The reversal of 99426809 is 90862499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 44622400 = 7403^2 + 6680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99426809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99426869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49713404 + 49713405.

It is an arithmetic number, because the mean of its divisors is an integer number (49713405).

Almost surely, 2^99426809 is an apocalyptic number.

It is an amenable number.

99426809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99426809 is an equidigital number, since it uses as much as digits as its factorization.

99426809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 99426809 is about 9971.2992633859. The cubic root of 99426809 is about 463.2703445361.

The spelling of 99426809 in words is "ninety-nine million, four hundred twenty-six thousand, eight hundred nine".