1801081 has 4 divisors (see below), whose sum is σ = 1804032. Its totient is φ = 1798132.

The previous prime is 1801073. The next prime is 1801091.

1801081 is nontrivially palindromic in base 4 and base 10.

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 1801081 - 2³ = 1801073 is a prime.

It is a super-2 number, since 2×1801081² = 6487785537122, which contains 22 as substring.

1801081 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

1801081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1801021) 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, 181 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (451008).

2^1801081 is an apocalyptic number.

It is an amenable number.

1801081 is a deficient number, since it is larger than the sum of its proper divisors (2951).

1801081 is an equidigital number, since it uses as much as digits as its factorization.

1801081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950.

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

The square root of 1801081 is about 1342.0435909463. The cubic root of 1801081 is about 121.6683863730.

The spelling of 1801081 in words is "one million, eight hundred one thousand, eighty-one".