99999199973 has 2 divisors, whose sum is σ = 99999199974. Its totient is φ = 99999199972.

The previous prime is 99999199931. The next prime is 99999199987. The reversal of 99999199973 is 37999199999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94892954209 + 5106245764 = 308047^2 + 71458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999199973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99999199891 and 99999199900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999199913) 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, 49999599986 + 49999599987.

It is an arithmetic number, because the mean of its divisors is an integer number (49999599987).

Almost surely, 2^99999199973 is an apocalyptic number.

It is an amenable number.

99999199973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999199973 is an equidigital number, since it uses as much as digits as its factorization.

99999199973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903981141, while the sum is 83.

The spelling of 99999199973 in words is "ninety-nine billion, nine hundred ninety-nine million, one hundred ninety-nine thousand, nine hundred seventy-three".