491059171 has 2 divisors, whose sum is σ = 491059172. Its totient is φ = 491059170.

The previous prime is 491059169. The next prime is 491059253. The reversal of 491059171 is 171950194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491059171 - 2¹ = 491059169 is a prime.

It is a super-2 number, since 2×491059171² = 482278218846414482, which contains 22 as substring.

Together with 491059169, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 491059171.

It is not a weakly prime, because it can be changed into another prime (491059571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245529585 + 245529586.

It is an arithmetic number, because the mean of its divisors is an integer number (245529586).

Almost surely, 2^491059171 is an apocalyptic number.

491059171 is a deficient number, since it is larger than the sum of its proper divisors (1).

491059171 is an equidigital number, since it uses as much as digits as its factorization.

491059171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 491059171 is about 22159.8549408610. The cubic root of 491059171 is about 788.9411499385.

The spelling of 491059171 in words is "four hundred ninety-one million, fifty-nine thousand, one hundred seventy-one".