921241755839 has 2 divisors, whose sum is σ = 921241755840. Its totient is φ = 921241755838.

The previous prime is 921241755817. The next prime is 921241755859. The reversal of 921241755839 is 938557142129.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921241755839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921241755859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460620877919 + 460620877920.

It is an arithmetic number, because the mean of its divisors is an integer number (460620877920).

Almost surely, 2^921241755839 is an apocalyptic number.

921241755839 is a deficient number, since it is larger than the sum of its proper divisors (1).

921241755839 is an equidigital number, since it uses as much as digits as its factorization.

921241755839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 56.

The spelling of 921241755839 in words is "nine hundred twenty-one billion, two hundred forty-one million, seven hundred fifty-five thousand, eight hundred thirty-nine".