199520287 has 4 divisors (see below), whose sum is σ = 199591920. Its totient is φ = 199448656.

The previous prime is 199520281. The next prime is 199520291. The reversal of 199520287 is 782025991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782025991 = 7229 ⋅108179.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199520287 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 (199520281) 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, 31462 + ... + 37267.

It is an arithmetic number, because the mean of its divisors is an integer number (49897980).

Almost surely, 2^199520287 is an apocalyptic number.

199520287 is a deficient number, since it is larger than the sum of its proper divisors (71633).

199520287 is an equidigital number, since it uses as much as digits as its factorization.

199520287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71632.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 199520287 is about 14125.1650255847. The cubic root of 199520287 is about 584.3356102097.

The spelling of 199520287 in words is "one hundred ninety-nine million, five hundred twenty thousand, two hundred eighty-seven".