199997047 has 4 divisors (see below), whose sum is σ = 200719336. Its totient is φ = 199274760.

The previous prime is 199997041. The next prime is 199997053. The reversal of 199997047 is 740799991.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (199997041) and next prime (199997053).

It is a cyclic number.

It is not a de Polignac number, because 199997047 - 2⁷ = 199996919 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 (199997041) 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, 360729 + ... + 361282.

It is an arithmetic number, because the mean of its divisors is an integer number (50179834).

Almost surely, 2^199997047 is an apocalyptic number.

199997047 is a deficient number, since it is larger than the sum of its proper divisors (722289).

199997047 is an equidigital number, since it uses as much as digits as its factorization.

199997047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722288.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 199997047 is about 14142.0312190293. The cubic root of 199997047 is about 584.8006694203.

The spelling of 199997047 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, forty-seven".