491681246825 has 6 divisors (see below), whose sum is σ = 609684746094. Its totient is φ = 393344997440.

The previous prime is 491681246809. The next prime is 491681246851. The reversal of 491681246825 is 528642186194.

It can be written as a sum of positive squares in 3 ways, for example, as 154002874624 + 337678372201 = 392432^2 + 581101^2 .

It is not a de Polignac number, because 491681246825 - 2⁴ = 491681246809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 9833624912 + ... + 9833624961.

It is an arithmetic number, because the mean of its divisors is an integer number (101614124349).

Almost surely, 2^491681246825 is an apocalyptic number.

It is an amenable number.

491681246825 is a deficient number, since it is larger than the sum of its proper divisors (118003499269).

491681246825 is a wasteful number, since it uses less digits than its factorization.

491681246825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19667249883 (or 19667249878 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The spelling of 491681246825 in words is "four hundred ninety-one billion, six hundred eighty-one million, two hundred forty-six thousand, eight hundred twenty-five".