491589167 has 2 divisors, whose sum is σ = 491589168. Its totient is φ = 491589166.

The previous prime is 491589101. The next prime is 491589169. The reversal of 491589167 is 761985194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491589167 - 2²⁴ = 474811951 is a prime.

It is a super-2 number, since 2×491589167² = 483319818223507778, which contains 22 as substring.

Together with 491589169, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491589169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245794583 + 245794584.

It is an arithmetic number, because the mean of its divisors is an integer number (245794584).

Almost surely, 2^491589167 is an apocalyptic number.

491589167 is a deficient number, since it is larger than the sum of its proper divisors (1).

491589167 is an equidigital number, since it uses as much as digits as its factorization.

491589167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 491589167 is about 22171.8101877136. The cubic root of 491589167 is about 789.2248803851.

The spelling of 491589167 in words is "four hundred ninety-one million, five hundred eighty-nine thousand, one hundred sixty-seven".