491257868439 has 8 divisors (see below), whose sum is σ = 705395913712. Its totient is φ = 302312534400.

The previous prime is 491257868399. The next prime is 491257868443. The reversal of 491257868439 is 934868752194.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-491257868439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491257868439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491257868489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6298177762 + ... + 6298177839.

It is an arithmetic number, because the mean of its divisors is an integer number (88174489214).

Almost surely, 2^491257868439 is an apocalyptic number.

491257868439 is a deficient number, since it is larger than the sum of its proper divisors (214138045273).

491257868439 is a wasteful number, since it uses less digits than its factorization.

491257868439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12596355617.

The product of its digits is 104509440, while the sum is 66.

The spelling of 491257868439 in words is "four hundred ninety-one billion, two hundred fifty-seven million, eight hundred sixty-eight thousand, four hundred thirty-nine".