1809055229881 has 4 divisors (see below), whose sum is σ = 1815447651472. Its totient is φ = 1802662808292.

The previous prime is 1809055229879. The next prime is 1809055229963. The reversal of 1809055229881 is 1889225509081.

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 1809055229881 - 2¹ = 1809055229879 is a prime.

It is a super-2 number, since 2×1809055229881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1809055229081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3196210371 + ... + 3196210936.

It is an arithmetic number, because the mean of its divisors is an integer number (453861912868).

Almost surely, 2^{1809055229881} is an apocalyptic number.

It is an amenable number.

1809055229881 is a deficient number, since it is larger than the sum of its proper divisors (6392421591).

1809055229881 is an equidigital number, since it uses as much as digits as its factorization.

1809055229881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392421590.

The product of its (nonzero) digits is 4147200, while the sum is 58.

The spelling of 1809055229881 in words is "one trillion, eight hundred nine billion, fifty-five million, two hundred twenty-nine thousand, eight hundred eighty-one".