199681097 has 12 divisors (see below), whose sum is σ = 250840128. Its totient is φ = 155595000.

The previous prime is 199681087. The next prime is 199681109. The reversal of 199681097 is 790186991.

It is not a de Polignac number, because 199681097 - 2¹⁰ = 199680073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199681067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117029 + ... + 118722.

It is an arithmetic number, because the mean of its divisors is an integer number (20903344).

Almost surely, 2^199681097 is an apocalyptic number.

It is an amenable number.

199681097 is a deficient number, since it is larger than the sum of its proper divisors (51159031).

199681097 is a wasteful number, since it uses less digits than its factorization.

199681097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235780 (or 235769 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 199681097 is about 14130.8562019433. The cubic root of 199681097 is about 584.4925562809.

The spelling of 199681097 in words is "one hundred ninety-nine million, six hundred eighty-one thousand, ninety-seven".