491589101 has 2 divisors, whose sum is σ = 491589102. Its totient is φ = 491589100.

The previous prime is 491589089. The next prime is 491589167. The reversal of 491589101 is 101985194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316662025 + 174927076 = 17795^2 + 13226^2 .

It is a cyclic number.

It is not a de Polignac number, because 491589101 - 2¹⁴ = 491572717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491589191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245794550 + 245794551.

It is an arithmetic number, because the mean of its divisors is an integer number (245794551).

Almost surely, 2^491589101 is an apocalyptic number.

It is an amenable number.

491589101 is a deficient number, since it is larger than the sum of its proper divisors (1).

491589101 is an equidigital number, since it uses as much as digits as its factorization.

491589101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 491589101 is about 22171.8086993371. The cubic root of 491589101 is about 789.2248450651.

The spelling of 491589101 in words is "four hundred ninety-one million, five hundred eighty-nine thousand, one hundred one".