9909900023 has 2 divisors, whose sum is σ = 9909900024. Its totient is φ = 9909900022.

The previous prime is 9909899971. The next prime is 9909900031. The reversal of 9909900023 is 3200099099.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9909900023 is a prime.

It is a super-2 number, since 2×9909900023² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909900223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954950011 + 4954950012.

It is an arithmetic number, because the mean of its divisors is an integer number (4954950012).

Almost surely, 2^9909900023 is an apocalyptic number.

9909900023 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909900023 is an equidigital number, since it uses as much as digits as its factorization.

9909900023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 9909900023 is about 99548.4807669108. The cubic root of 9909900023 is about 2147.9446752884.

The spelling of 9909900023 in words is "nine billion, nine hundred nine million, nine hundred thousand, twenty-three".