491626908609 has 16 divisors (see below), whose sum is σ = 707588956800. Its totient is φ = 302690829056.

The previous prime is 491626908601. The next prime is 491626908613. The reversal of 491626908609 is 906809626194.

It is a cyclic number.

It is not a de Polignac number, because 491626908609 - 2³ = 491626908601 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (491626908601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 122843304 + ... + 122847305.

It is an arithmetic number, because the mean of its divisors is an integer number (44224309800).

Almost surely, 2^491626908609 is an apocalyptic number.

It is an amenable number.

491626908609 is a deficient number, since it is larger than the sum of its proper divisors (215962048191).

491626908609 is a wasteful number, since it uses less digits than its factorization.

491626908609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245690664.

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 491626908609 in words is "four hundred ninety-one billion, six hundred twenty-six million, nine hundred eight thousand, six hundred nine".