201643446 has 16 divisors (see below), whose sum is σ = 404307504. Its totient is φ = 67044384.

The previous prime is 201643441. The next prime is 201643493. The reversal of 201643446 is 644346102.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201643441) 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 7 ways as a sum of consecutive naturals, for example, 39945 + ... + 44708.

It is an arithmetic number, because the mean of its divisors is an integer number (25269219).

Almost surely, 2^201643446 is an apocalyptic number.

201643446 is an abundant number, since it is smaller than the sum of its proper divisors (202664058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201643446 is a wasteful number, since it uses less digits than its factorization.

201643446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85055.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 201643446 is about 14200.1213375098. The cubic root of 201643446 is about 586.4010018024.

Adding to 201643446 its reverse (644346102), we get a palindrome (845989548).

The spelling of 201643446 in words is "two hundred one million, six hundred forty-three thousand, four hundred forty-six".