1801801 has 4 divisors (see below), whose sum is σ = 1832400. Its totient is φ = 1771204.

The previous prime is 1801781. The next prime is 1801817. The reversal of 1801801 is 1081081.

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 1801801 - 2⁵ = 1801769 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1801871) 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, 15211 + ... + 15328.

It is an arithmetic number, because the mean of its divisors is an integer number (458100).

2^1801801 is an apocalyptic number.

It is an amenable number.

1801801 is a deficient number, since it is larger than the sum of its proper divisors (30599).

1801801 is an equidigital number, since it uses as much as digits as its factorization.

1801801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30598.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1801801 is about 1342.3118117636. The cubic root of 1801801 is about 121.6845969279.

Adding to 1801801 its reverse (1081081), we get a palindrome (2882882).

The spelling of 1801801 in words is "one million, eight hundred one thousand, eight hundred one".