2081801 has 2 divisors, whose sum is σ = 2081802. Its totient is φ = 2081800.

The previous prime is 2081797. The next prime is 2081809. The reversal of 2081801 is 1081802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 121801 = 1400^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081801 - 2² = 2081797 is a prime.

It is not a weakly prime, because it can be changed into another prime (2081809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040900 + 1040901.

It is an arithmetic number, because the mean of its divisors is an integer number (1040901).

2^2081801 is an apocalyptic number.

It is an amenable number.

2081801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081801 is an equidigital number, since it uses as much as digits as its factorization.

2081801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2081801 is about 1442.8447594942. The cubic root of 2081801 is about 127.6869179457.

Subtracting from 2081801 its reverse (1081802), we obtain a palindrome (999999).

It can be divided in two parts, 2081 and 801, that added together give a palindrome (2882).

The spelling of 2081801 in words is "two million, eighty-one thousand, eight hundred one".