844040881 has 2 divisors, whose sum is σ = 844040882. Its totient is φ = 844040880.

The previous prime is 844040849. The next prime is 844040887. The reversal of 844040881 is 188040448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709689600 + 134351281 = 26640^2 + 11591^2 .

It is a cyclic number.

It is not a de Polignac number, because 844040881 - 2⁵ = 844040849 is a prime.

It is a super-2 number, since 2×844040881² = 1424810017598512322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 844040881.

It is not a weakly prime, because it can be changed into another prime (844040887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422020440 + 422020441.

It is an arithmetic number, because the mean of its divisors is an integer number (422020441).

Almost surely, 2^844040881 is an apocalyptic number.

It is an amenable number.

844040881 is a deficient number, since it is larger than the sum of its proper divisors (1).

844040881 is an equidigital number, since it uses as much as digits as its factorization.

844040881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32768, while the sum is 37.

The square root of 844040881 is about 29052.3816751742. The cubic root of 844040881 is about 945.0493637138.

The spelling of 844040881 in words is "eight hundred forty-four million, forty thousand, eight hundred eighty-one".