201643135 has 16 divisors (see below), whose sum is σ = 244543680. Its totient is φ = 159609600.

The previous prime is 201643129. The next prime is 201643157. The reversal of 201643135 is 531346102.

201643135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201643135 - 2¹⁷ = 201512063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308469 + ... + 309121.

It is an arithmetic number, because the mean of its divisors is an integer number (15283980).

Almost surely, 2^201643135 is an apocalyptic number.

201643135 is a deficient number, since it is larger than the sum of its proper divisors (42900545).

201643135 is a wasteful number, since it uses less digits than its factorization.

201643135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 201643135 is about 14200.1103868949. The cubic root of 201643135 is about 586.4007003283.

Adding to 201643135 its reverse (531346102), we get a palindrome (732989237).

The spelling of 201643135 in words is "two hundred one million, six hundred forty-three thousand, one hundred thirty-five".