491729646431 has 2 divisors, whose sum is σ = 491729646432. Its totient is φ = 491729646430.

The previous prime is 491729646407. The next prime is 491729646479. The reversal of 491729646431 is 134646927194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491729646431 - 2¹⁸ = 491729384287 is a prime.

It is a super-2 number, since 2×491729646431² (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 (491729246431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245864823215 + 245864823216.

It is an arithmetic number, because the mean of its divisors is an integer number (245864823216).

Almost surely, 2^491729646431 is an apocalyptic number.

491729646431 is a deficient number, since it is larger than the sum of its proper divisors (1).

491729646431 is an equidigital number, since it uses as much as digits as its factorization.

491729646431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 56.

The spelling of 491729646431 in words is "four hundred ninety-one billion, seven hundred twenty-nine million, six hundred forty-six thousand, four hundred thirty-one".