199245973 has 2 divisors, whose sum is σ = 199245974. Its totient is φ = 199245972.

The previous prime is 199245971. The next prime is 199245983. The reversal of 199245973 is 379542991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133587364 + 65658609 = 11558^2 + 8103^2 .

It is a cyclic number.

It is not a de Polignac number, because 199245973 - 2¹ = 199245971 is a prime.

Together with 199245971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199245971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99622986 + 99622987.

It is an arithmetic number, because the mean of its divisors is an integer number (99622987).

Almost surely, 2^199245973 is an apocalyptic number.

It is an amenable number.

199245973 is a deficient number, since it is larger than the sum of its proper divisors (1).

199245973 is an equidigital number, since it uses as much as digits as its factorization.

199245973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 49.

The square root of 199245973 is about 14115.4515691139. The cubic root of 199245973 is about 584.0676926678.

The spelling of 199245973 in words is "one hundred ninety-nine million, two hundred forty-five thousand, nine hundred seventy-three".