1811201 has 4 divisors (see below), whose sum is σ = 2069952. Its totient is φ = 1552452.

The previous prime is 1811179. The next prime is 1811209. The reversal of 1811201 is 1021181.

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 1811201 - 2¹⁴ = 1794817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1811209) 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, 129365 + ... + 129378.

It is an arithmetic number, because the mean of its divisors is an integer number (517488).

2^1811201 is an apocalyptic number.

It is an amenable number.

1811201 is a deficient number, since it is larger than the sum of its proper divisors (258751).

1811201 is an equidigital number, since it uses as much as digits as its factorization.

1811201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258750.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1811201 is about 1345.8086788247. The cubic root of 1811201 is about 121.8958396097.

Adding to 1811201 its reverse (1021181), we get a palindrome (2832382).

The spelling of 1811201 in words is "one million, eight hundred eleven thousand, two hundred one".