99564973 has 2 divisors, whose sum is σ = 99564974. Its totient is φ = 99564972.

The previous prime is 99564947. The next prime is 99564979. The reversal of 99564973 is 37946599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99560484 + 4489 = 9978^2 + 67^2 .

It is an emirp because it is prime and its reverse (37946599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99564973 - 2¹³ = 99556781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99564973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99564979) 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, 49782486 + 49782487.

It is an arithmetic number, because the mean of its divisors is an integer number (49782487).

Almost surely, 2^99564973 is an apocalyptic number.

It is an amenable number.

99564973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99564973 is an equidigital number, since it uses as much as digits as its factorization.

99564973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 99564973 is about 9978.2249423432. The cubic root of 99564973 is about 463.4848328252.

The spelling of 99564973 in words is "ninety-nine million, five hundred sixty-four thousand, nine hundred seventy-three".