209257201 has 4 divisors (see below), whose sum is σ = 212123812. Its totient is φ = 206390592.

The previous prime is 209257183. The next prime is 209257231. The reversal of 209257201 is 102752902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176252176 + 33005025 = 13276^2 + 5745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209257201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209257201.

It is not an unprimeable number, because it can be changed into a prime (209257231) 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 3 ways as a sum of consecutive naturals, for example, 1433196 + ... + 1433341.

It is an arithmetic number, because the mean of its divisors is an integer number (53030953).

Almost surely, 2^209257201 is an apocalyptic number.

It is an amenable number.

209257201 is a deficient number, since it is larger than the sum of its proper divisors (2866611).

209257201 is an equidigital number, since it uses as much as digits as its factorization.

209257201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866610.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 209257201 is about 14465.7250423199. The cubic root of 209257201 is about 593.6905515956.

The spelling of 209257201 in words is "two hundred nine million, two hundred fifty-seven thousand, two hundred one".