201643361 has 4 divisors (see below), whose sum is σ = 203231232. Its totient is φ = 200055492.

The previous prime is 201643357. The next prime is 201643363. The reversal of 201643361 is 163346102.

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 201643361 - 2² = 201643357 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 201643361.

It is not an unprimeable number, because it can be changed into a prime (201643363) 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 3 ways as a sum of consecutive naturals, for example, 793745 + ... + 793998.

It is an arithmetic number, because the mean of its divisors is an integer number (50807808).

Almost surely, 2^201643361 is an apocalyptic number.

It is an amenable number.

201643361 is a deficient number, since it is larger than the sum of its proper divisors (1587871).

201643361 is a wasteful number, since it uses less digits than its factorization.

201643361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587870.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 201643361 is about 14200.1183445773. The cubic root of 201643361 is about 586.4009194060.

Adding to 201643361 its reverse (163346102), we get a palindrome (364989463).

The spelling of 201643361 in words is "two hundred one million, six hundred forty-three thousand, three hundred sixty-one".