1839781335881 has 2 divisors, whose sum is σ = 1839781335882. Its totient is φ = 1839781335880.

The previous prime is 1839781335877. The next prime is 1839781335883. The reversal of 1839781335881 is 1885331879381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1833562436281 + 6218899600 = 1354091^2 + 78860^2 .

It is an emirp because it is prime and its reverse (1885331879381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1839781335881 - 2² = 1839781335877 is a prime.

It is a super-2 number, since 2×1839781335881² (a number of 25 digits) contains 22 as substring.

Together with 1839781335883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1839781335883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919890667940 + 919890667941.

It is an arithmetic number, because the mean of its divisors is an integer number (919890667941).

Almost surely, 2^{1839781335881} is an apocalyptic number.

It is an amenable number.

1839781335881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1839781335881 is an equidigital number, since it uses as much as digits as its factorization.

1839781335881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 65.

The spelling of 1839781335881 in words is "one trillion, eight hundred thirty-nine billion, seven hundred eighty-one million, three hundred thirty-five thousand, eight hundred eighty-one".