1801784881 has 6 divisors (see below), whose sum is σ = 1951045350. Its totient is φ = 1663185888.

The previous prime is 1801784869. The next prime is 1801784891. The reversal of 1801784881 is 1884871081.

It can be written as a sum of positive squares in 3 ways, for example, as 135839025 + 1665945856 = 11655^2 + 40816^2 .

It is not a de Polignac number, because 1801784881 - 2¹⁷ = 1801653809 is a prime.

It is a super-2 number, since 2×1801784881² = 6492857514800368322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801784861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5330556 + ... + 5330893.

It is an arithmetic number, because the mean of its divisors is an integer number (325174225).

Almost surely, 2^1801784881 is an apocalyptic number.

It is an amenable number.

1801784881 is a deficient number, since it is larger than the sum of its proper divisors (149260469).

1801784881 is a wasteful number, since it uses less digits than its factorization.

1801784881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661475 (or 10661462 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 46.

The square root of 1801784881 is about 42447.4366835030. The cubic root of 1801784881 is about 1216.8423406140.

The spelling of 1801784881 in words is "one billion, eight hundred one million, seven hundred eighty-four thousand, eight hundred eighty-one".