1810201 has 4 divisors (see below), whose sum is σ = 1822500. Its totient is φ = 1797904.

The previous prime is 1810199. The next prime is 1810213. The reversal of 1810201 is 1020181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1020181 = 173 ⋅5897.

It can be written as a sum of positive squares in 2 ways, for example, as 1104601 + 705600 = 1051^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810201 - 2¹ = 1810199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1810241) 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 3 ways as a sum of consecutive naturals, for example, 5926 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (455625).

2^1810201 is an apocalyptic number.

It is an amenable number.

1810201 is a deficient number, since it is larger than the sum of its proper divisors (12299).

1810201 is a wasteful number, since it uses less digits than its factorization.

1810201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12298.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1810201 is about 1345.4371036953. The cubic root of 1810201 is about 121.8734017761.

Adding to 1810201 its reverse (1020181), we get a palindrome (2830382).

The spelling of 1810201 in words is "one million, eight hundred ten thousand, two hundred one".