209370161 has 32 divisors (see below), whose sum is σ = 288761088. Its totient is φ = 146499840.

The previous prime is 209370157. The next prime is 209370167. The reversal of 209370161 is 161073902.

It is a cyclic number.

It is not a de Polignac number, because 209370161 - 2² = 209370157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209370167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34211 + ... + 39863.

It is an arithmetic number, because the mean of its divisors is an integer number (9023784).

Almost surely, 2^209370161 is an apocalyptic number.

It is an amenable number.

209370161 is a deficient number, since it is larger than the sum of its proper divisors (79390927).

209370161 is a wasteful number, since it uses less digits than its factorization.

209370161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5721.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 209370161 is about 14469.6289171492. The cubic root of 209370161 is about 593.7973599010.

The spelling of 209370161 in words is "two hundred nine million, three hundred seventy thousand, one hundred sixty-one".