2804382181981 has 4 divisors (see below), whose sum is σ = 2805463704892. Its totient is φ = 2803300659072.

The previous prime is 2804382181927. The next prime is 2804382182033. The reversal of 2804382181981 is 1891812834082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 768937825881 + 2035444356100 = 876891^2 + 1426690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2804382181981 is a prime.

It is a super-2 number, since 2×2804382181981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2804382188981) 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, 540757566 + ... + 540762751.

It is an arithmetic number, because the mean of its divisors is an integer number (701365926223).

Almost surely, 2^{2804382181981} is an apocalyptic number.

It is an amenable number.

2804382181981 is a deficient number, since it is larger than the sum of its proper divisors (1081522911).

2804382181981 is a wasteful number, since it uses less digits than its factorization.

2804382181981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081522910.

The product of its (nonzero) digits is 1769472, while the sum is 55.

The spelling of 2804382181981 in words is "two trillion, eight hundred four billion, three hundred eighty-two million, one hundred eighty-one thousand, nine hundred eighty-one".