1643201 has 4 divisors (see below), whose sum is σ = 1877952. Its totient is φ = 1408452.

The previous prime is 1643197. The next prime is 1643219. The reversal of 1643201 is 1023461.

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 1643201 - 2² = 1643197 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 1643201.

It is not an unprimeable number, because it can be changed into a prime (1643221) 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, 117365 + ... + 117378.

It is an arithmetic number, because the mean of its divisors is an integer number (469488).

2^1643201 is an apocalyptic number.

It is an amenable number.

1643201 is a deficient number, since it is larger than the sum of its proper divisors (234751).

1643201 is an equidigital number, since it uses as much as digits as its factorization.

1643201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234750.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1643201 is about 1281.8740187710. The cubic root of 1643201 is about 118.0040456336.

Adding to 1643201 its reverse (1023461), we get a palindrome (2666662).

The spelling of 1643201 in words is "one million, six hundred forty-three thousand, two hundred one".