491498369 has 2 divisors, whose sum is σ = 491498370. Its totient is φ = 491498368.

The previous prime is 491498341. The next prime is 491498389. The reversal of 491498369 is 963894194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258019969 + 233478400 = 16063^2 + 15280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491498369 is a prime.

It is a super-2 number, since 2×491498369² = 483141293459320322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491498369.

It is not a weakly prime, because it can be changed into another prime (491498389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245749184 + 245749185.

It is an arithmetic number, because the mean of its divisors is an integer number (245749185).

Almost surely, 2^491498369 is an apocalyptic number.

It is an amenable number.

491498369 is a deficient number, since it is larger than the sum of its proper divisors (1).

491498369 is an equidigital number, since it uses as much as digits as its factorization.

491498369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 53.

The square root of 491498369 is about 22169.7624930895. The cubic root of 491498369 is about 789.1762866555.

The spelling of 491498369 in words is "four hundred ninety-one million, four hundred ninety-eight thousand, three hundred sixty-nine".