491316077617 has 4 divisors (see below), whose sum is σ = 491808873076. Its totient is φ = 490823282160.

The previous prime is 491316077591. The next prime is 491316077627. The reversal of 491316077617 is 716770613194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716770613194 = 2 ⋅358385306597.

It can be written as a sum of positive squares in 2 ways, for example, as 185865316641 + 305450760976 = 431121^2 + 552676^2 .

It is a cyclic number.

It is not a de Polignac number, because 491316077617 - 2³⁵ = 456956339249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491316077627) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 246396234 + ... + 246398227.

It is an arithmetic number, because the mean of its divisors is an integer number (122952218269).

Almost surely, 2^491316077617 is an apocalyptic number.

It is an amenable number.

491316077617 is a deficient number, since it is larger than the sum of its proper divisors (492795459).

491316077617 is an equidigital number, since it uses as much as digits as its factorization.

491316077617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492795458.

The product of its (nonzero) digits is 1333584, while the sum is 52.

The spelling of 491316077617 in words is "four hundred ninety-one billion, three hundred sixteen million, seventy-seven thousand, six hundred seventeen".