491057403839 has 2 divisors, whose sum is σ = 491057403840. Its totient is φ = 491057403838.

The previous prime is 491057403833. The next prime is 491057403857. The reversal of 491057403839 is 938304750194.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491057403839 is a prime.

It is a super-2 number, since 2×491057403839² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491057403833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245528701919 + 245528701920.

It is an arithmetic number, because the mean of its divisors is an integer number (245528701920).

Almost surely, 2^491057403839 is an apocalyptic number.

491057403839 is a deficient number, since it is larger than the sum of its proper divisors (1).

491057403839 is an equidigital number, since it uses as much as digits as its factorization.

491057403839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 491057403839 in words is "four hundred ninety-one billion, fifty-seven million, four hundred three thousand, eight hundred thirty-nine".