199997001 has 6 divisors (see below), whose sum is σ = 288884570. Its totient is φ = 133331328.

The previous prime is 199996997. The next prime is 199997003. The reversal of 199997001 is 100799991.

It can be written as a sum of positive squares in only one way, i.e., 198133776 + 1863225 = 14076^2 + 1365^2 .

It is not a de Polignac number, because 199997001 - 2² = 199996997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199997003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11110936 + ... + 11110953.

Almost surely, 2^199997001 is an apocalyptic number.

It is an amenable number.

199997001 is a deficient number, since it is larger than the sum of its proper divisors (88887569).

199997001 is a wasteful number, since it uses less digits than its factorization.

199997001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22221895 (or 22221892 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 199997001 is about 14142.0295926716. The cubic root of 199997001 is about 584.8006245849.

It can be divided in two parts, 19999 and 7001, that added together give a cube (27000 = 30³).

The spelling of 199997001 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, one".