19990573 has 2 divisors, whose sum is σ = 19990574. Its totient is φ = 19990572.

The previous prime is 19990561. The next prime is 19990577. The reversal of 19990573 is 37509991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16670889 + 3319684 = 4083^2 + 1822^2 .

It is an emirp because it is prime and its reverse (37509991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19990573 - 2¹³ = 19982381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19990577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995286 + 9995287.

It is an arithmetic number, because the mean of its divisors is an integer number (9995287).

Almost surely, 2^19990573 is an apocalyptic number.

It is an amenable number.

19990573 is a deficient number, since it is larger than the sum of its proper divisors (1).

19990573 is an equidigital number, since it uses as much as digits as its factorization.

19990573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 19990573 is about 4471.0818601318. The cubic root of 19990573 is about 271.3991069322.

The spelling of 19990573 in words is "nineteen million, nine hundred ninety thousand, five hundred seventy-three".