491107172863 has 2 divisors, whose sum is σ = 491107172864. Its totient is φ = 491107172862.

The previous prime is 491107172737. The next prime is 491107172867. The reversal of 491107172863 is 368271701194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491107172863 - 2²⁹ = 490570301951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491107172867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245553586431 + 245553586432.

It is an arithmetic number, because the mean of its divisors is an integer number (245553586432).

Almost surely, 2^491107172863 is an apocalyptic number.

491107172863 is a deficient number, since it is larger than the sum of its proper divisors (1).

491107172863 is an equidigital number, since it uses as much as digits as its factorization.

491107172863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 491107172863 in words is "four hundred ninety-one billion, one hundred seven million, one hundred seventy-two thousand, eight hundred sixty-three".