491879863131 has 8 divisors (see below), whose sum is σ = 690357702720. Its totient is φ = 310660966152.

The previous prime is 491879863103. The next prime is 491879863157. The reversal of 491879863131 is 131368978194.

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

It is not a de Polignac number, because 491879863131 - 2⁷ = 491879863003 is a prime.

It is a super-2 number, since 2×491879863131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491879863831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4314735585 + ... + 4314735698.

It is an arithmetic number, because the mean of its divisors is an integer number (86294712840).

Almost surely, 2^491879863131 is an apocalyptic number.

491879863131 is a deficient number, since it is larger than the sum of its proper divisors (198477839589).

491879863131 is a wasteful number, since it uses less digits than its factorization.

491879863131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8629471305.

The product of its digits is 7838208, while the sum is 60.

The spelling of 491879863131 in words is "four hundred ninety-one billion, eight hundred seventy-nine million, eight hundred sixty-three thousand, one hundred thirty-one".