209361601 has 4 divisors (see below), whose sum is σ = 210646192. Its totient is φ = 208077012.

The previous prime is 209361583. The next prime is 209361629. The reversal of 209361601 is 106163902.

209361601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209361601 - 2⁷ = 209361473 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 209361601.

It is not an unprimeable number, because it can be changed into a prime (209361301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642051 + ... + 642376.

It is an arithmetic number, because the mean of its divisors is an integer number (52661548).

Almost surely, 2^209361601 is an apocalyptic number.

It is an amenable number.

209361601 is a deficient number, since it is larger than the sum of its proper divisors (1284591).

209361601 is a wasteful number, since it uses less digits than its factorization.

209361601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284590.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 209361601 is about 14469.3331221587. Note that the first 3 decimals coincide. The cubic root of 209361601 is about 593.7892674159.

The spelling of 209361601 in words is "two hundred nine million, three hundred sixty-one thousand, six hundred one".