99973904549 has 2 divisors, whose sum is σ = 99973904550. Its totient is φ = 99973904548.

The previous prime is 99973904533. The next prime is 99973904557. The reversal of 99973904549 is 94540937999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97792547524 + 2181357025 = 312718^2 + 46705^2 .

It is a cyclic number.

It is not a de Polignac number, because 99973904549 - 2⁴ = 99973904533 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99973904509) 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, 49986952274 + 49986952275.

It is an arithmetic number, because the mean of its divisors is an integer number (49986952275).

Almost surely, 2^99973904549 is an apocalyptic number.

It is an amenable number.

99973904549 is a deficient number, since it is larger than the sum of its proper divisors (1).

99973904549 is an equidigital number, since it uses as much as digits as its factorization.

99973904549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99202320, while the sum is 68.

The spelling of 99973904549 in words is "ninety-nine billion, nine hundred seventy-three million, nine hundred four thousand, five hundred forty-nine".