1801075021 has 8 divisors (see below), whose sum is σ = 1830292344. Its totient is φ = 1772090880.

The previous prime is 1801075009. The next prime is 1801075027. The reversal of 1801075021 is 1205701081.

It can be written as a sum of positive squares in 4 ways, for example, as 98604900 + 1702470121 = 9930^2 + 41261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801075021 - 2⁷ = 1801074893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801075027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42690 + ... + 73651.

It is an arithmetic number, because the mean of its divisors is an integer number (228786543).

Almost surely, 2^1801075021 is an apocalyptic number.

It is an amenable number.

1801075021 is a deficient number, since it is larger than the sum of its proper divisors (29217323).

1801075021 is a wasteful number, since it uses less digits than its factorization.

1801075021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116591.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 1801075021 is about 42439.0742241157. The cubic root of 1801075021 is about 1216.6825173974.

The spelling of 1801075021 in words is "one billion, eight hundred one million, seventy-five thousand, twenty-one".