206197971 has 16 divisors (see below), whose sum is σ = 316320000. Its totient is φ = 117034848.

The previous prime is 206197961. The next prime is 206198009. The reversal of 206197971 is 179791602.

It is a happy number.

It is not a de Polignac number, because 206197971 - 2⁵ = 206197939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206197961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29821 + ... + 36078.

It is an arithmetic number, because the mean of its divisors is an integer number (19770000).

Almost surely, 2^206197971 is an apocalyptic number.

206197971 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

206197971 is a deficient number, since it is larger than the sum of its proper divisors (110122029).

206197971 is a wasteful number, since it uses less digits than its factorization.

206197971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66058.

The product of its (nonzero) digits is 47628, while the sum is 42.

The square root of 206197971 is about 14359.5950848205. The cubic root of 206197971 is about 590.7831895305.

The spelling of 206197971 in words is "two hundred six million, one hundred ninety-seven thousand, nine hundred seventy-one".