844040831 has 2 divisors, whose sum is σ = 844040832. Its totient is φ = 844040830.

The previous prime is 844040809. The next prime is 844040833. The reversal of 844040831 is 138040448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 844040831 - 2⁶ = 844040767 is a prime.

It is a super-2 number, since 2×844040831² = 1424809848790341122, which contains 22 as substring.

Together with 844040833, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_43292165 and since 844040831 and 43292165 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844040833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422020415 + 422020416.

It is an arithmetic number, because the mean of its divisors is an integer number (422020416).

Almost surely, 2^844040831 is an apocalyptic number.

844040831 is a deficient number, since it is larger than the sum of its proper divisors (1).

844040831 is an equidigital number, since it uses as much as digits as its factorization.

844040831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 844040831 is about 29052.3808146596. The cubic root of 844040831 is about 945.0493450526.

The spelling of 844040831 in words is "eight hundred forty-four million, forty thousand, eight hundred thirty-one".