491399307522 has 54 divisors (see below), whose sum is σ = 1073973461769. Its totient is φ = 162385095600.

The previous prime is 491399307517. The next prime is 491399307559. The reversal of 491399307522 is 225703993194.

491399307522 is a `hidden beast` number, since 491 + 39 + 9 + 30 + 75 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 264948002361 + 226451305161 = 514731^2 + 475869^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=495681.

It is a super-2 number, since 2×491399307522² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 377708272 + ... + 377709572.

Almost surely, 2^491399307522 is an apocalyptic number.

491399307522 is an abundant number, since it is smaller than the sum of its proper divisors (582574154247).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491399307522 is an equidigital number, since it uses as much as digits as its factorization.

491399307522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 491399307522 in words is "four hundred ninety-one billion, three hundred ninety-nine million, three hundred seven thousand, five hundred twenty-two".