199997533 has 4 divisors (see below), whose sum is σ = 200208348. Its totient is φ = 199786720.

The previous prime is 199997531. The next prime is 199997573. The reversal of 199997533 is 335799991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335799991 = 151 ⋅2223841.

It can be written as a sum of positive squares in 2 ways, for example, as 82773604 + 117223929 = 9098^2 + 10827^2 .

It is a cyclic number.

It is not a de Polignac number, because 199997533 - 2¹ = 199997531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199997531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103978 + ... + 105883.

It is an arithmetic number, because the mean of its divisors is an integer number (50052087).

Almost surely, 2^199997533 is an apocalyptic number.

It is an amenable number.

199997533 is a deficient number, since it is larger than the sum of its proper divisors (210815).

199997533 is an equidigital number, since it uses as much as digits as its factorization.

199997533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210814.

The product of its digits is 2066715, while the sum is 55.

The square root of 199997533 is about 14142.0484018405. The cubic root of 199997533 is about 584.8011431154.

The spelling of 199997533 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, five hundred thirty-three".