2491881839 has 2 divisors, whose sum is σ = 2491881840. Its totient is φ = 2491881838.

The previous prime is 2491881829. The next prime is 2491881851. The reversal of 2491881839 is 9381881942.

2491881839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2491881839 - 2²⁴ = 2475104623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491881829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245940919 + 1245940920.

It is an arithmetic number, because the mean of its divisors is an integer number (1245940920).

Almost surely, 2^2491881839 is an apocalyptic number.

2491881839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491881839 is an equidigital number, since it uses as much as digits as its factorization.

2491881839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 53.

The square root of 2491881839 is about 49918.7523782396. The cubic root of 2491881839 is about 1355.7381433187.

The spelling of 2491881839 in words is "two billion, four hundred ninety-one million, eight hundred eighty-one thousand, eight hundred thirty-nine".