99810001 has 2 divisors, whose sum is σ = 99810002. Its totient is φ = 99810000.

The previous prime is 99809981. The next prime is 99810013. The reversal of 99810001 is 10001899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85377600 + 14432401 = 9240^2 + 3799^2 .

It is a cyclic number.

It is not a de Polignac number, because 99810001 - 2¹⁹ = 99285713 is a prime.

It is not a weakly prime, because it can be changed into another prime (99810901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49905000 + 49905001.

It is an arithmetic number, because the mean of its divisors is an integer number (49905001).

Almost surely, 2^99810001 is an apocalyptic number.

It is an amenable number.

99810001 is a deficient number, since it is larger than the sum of its proper divisors (1).

99810001 is an equidigital number, since it uses as much as digits as its factorization.

99810001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 99810001 is about 9990.4955332556. The cubic root of 99810001 is about 463.8647312416.

The spelling of 99810001 in words is "ninety-nine million, eight hundred ten thousand, one".