99861973 has 2 divisors, whose sum is σ = 99861974. Its totient is φ = 99861972.

The previous prime is 99861947. The next prime is 99862013. The reversal of 99861973 is 37916899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84511249 + 15350724 = 9193^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 99861973 - 2²⁵ = 66307541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99861973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99861913) 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, 49930986 + 49930987.

It is an arithmetic number, because the mean of its divisors is an integer number (49930987).

Almost surely, 2^99861973 is an apocalyptic number.

It is an amenable number.

99861973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99861973 is an equidigital number, since it uses as much as digits as its factorization.

99861973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 99861973 is about 9993.0962669235. The cubic root of 99861973 is about 463.9452301708.

The spelling of 99861973 in words is "ninety-nine million, eight hundred sixty-one thousand, nine hundred seventy-three".