98772809 has 2 divisors, whose sum is σ = 98772810. Its totient is φ = 98772808.

The previous prime is 98772799. The next prime is 98772859. The reversal of 98772809 is 90827789.

It is a happy number.

It is an a-pointer prime, because the next prime (98772859) can be obtained adding 98772809 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77933584 + 20839225 = 8828^2 + 4565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98772809 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 (98772859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49386404 + 49386405.

It is an arithmetic number, because the mean of its divisors is an integer number (49386405).

Almost surely, 2^98772809 is an apocalyptic number.

It is an amenable number.

98772809 is a deficient number, since it is larger than the sum of its proper divisors (1).

98772809 is an equidigital number, since it uses as much as digits as its factorization.

98772809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 98772809 is about 9938.4510362531. The cubic root of 98772809 is about 462.2523577103.

The spelling of 98772809 in words is "ninety-eight million, seven hundred seventy-two thousand, eight hundred nine".