99945817 has 2 divisors, whose sum is σ = 99945818. Its totient is φ = 99945816.

The previous prime is 99945763. The next prime is 99945841. The reversal of 99945817 is 71854999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97042201 + 2903616 = 9851^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 99945817 - 2²³ = 91557209 is a prime.

It is not a weakly prime, because it can be changed into another prime (99945217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49972908 + 49972909.

It is an arithmetic number, because the mean of its divisors is an integer number (49972909).

Almost surely, 2^99945817 is an apocalyptic number.

It is an amenable number.

99945817 is a deficient number, since it is larger than the sum of its proper divisors (1).

99945817 is an equidigital number, since it uses as much as digits as its factorization.

99945817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 99945817 is about 9997.2904829259. The cubic root of 99945817 is about 464.0750364799.

The spelling of 99945817 in words is "ninety-nine million, nine hundred forty-five thousand, eight hundred seventeen".