491097589 has 2 divisors, whose sum is σ = 491097590. Its totient is φ = 491097588.

The previous prime is 491097553. The next prime is 491097611. The reversal of 491097589 is 985790194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294396964 + 196700625 = 17158^2 + 14025^2 .

It is a cyclic number.

It is not a de Polignac number, because 491097589 - 2⁹ = 491097077 is a prime.

It is a super-2 number, since 2×491097589² = 482353683843225842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491097289) 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, 245548794 + 245548795.

It is an arithmetic number, because the mean of its divisors is an integer number (245548795).

Almost surely, 2^491097589 is an apocalyptic number.

It is an amenable number.

491097589 is a deficient number, since it is larger than the sum of its proper divisors (1).

491097589 is an equidigital number, since it uses as much as digits as its factorization.

491097589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 491097589 is about 22160.7217617116. The cubic root of 491097589 is about 788.9617236646.

The spelling of 491097589 in words is "four hundred ninety-one million, ninety-seven thousand, five hundred eighty-nine".