99945973 has 2 divisors, whose sum is σ = 99945974. Its totient is φ = 99945972.

The previous prime is 99945929. The next prime is 99946013. The reversal of 99945973 is 37954999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75916369 + 24029604 = 8713^2 + 4902^2 .

It is a cyclic number.

It is not a de Polignac number, because 99945973 - 2¹⁷ = 99814901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99945913) 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, 49972986 + 49972987.

It is an arithmetic number, because the mean of its divisors is an integer number (49972987).

Almost surely, 2^99945973 is an apocalyptic number.

It is an amenable number.

99945973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99945973 is an equidigital number, since it uses as much as digits as its factorization.

99945973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 55.

The square root of 99945973 is about 9997.2982850368. The cubic root of 99945973 is about 464.0752779297.

The spelling of 99945973 in words is "ninety-nine million, nine hundred forty-five thousand, nine hundred seventy-three".