209739201 has 16 divisors (see below), whose sum is σ = 321282048. Its totient is φ = 119221200.

The previous prime is 209739197. The next prime is 209739221. The reversal of 209739201 is 102937902.

It is not a de Polignac number, because 209739201 - 2² = 209739197 is a prime.

It is a super-2 number, since 2×209739201² = 87981064872236802, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (209739221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22135 + ... + 30156.

It is an arithmetic number, because the mean of its divisors is an integer number (20080128).

Almost surely, 2^209739201 is an apocalyptic number.

209739201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

209739201 is a deficient number, since it is larger than the sum of its proper divisors (111542847).

209739201 is a wasteful number, since it uses less digits than its factorization.

209739201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52492.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 209739201 is about 14482.3755302782. The cubic root of 209739201 is about 594.1460347902.

The spelling of 209739201 in words is "two hundred nine million, seven hundred thirty-nine thousand, two hundred one".