491244521 has 4 divisors (see below), whose sum is σ = 497973972. Its totient is φ = 484515072.

The previous prime is 491244497. The next prime is 491244539. The reversal of 491244521 is 125442194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 338376025 + 152868496 = 18395^2 + 12364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491244521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491244541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3364616 + ... + 3364761.

It is an arithmetic number, because the mean of its divisors is an integer number (124493493).

Almost surely, 2^491244521 is an apocalyptic number.

It is an amenable number.

491244521 is a deficient number, since it is larger than the sum of its proper divisors (6729451).

491244521 is an equidigital number, since it uses as much as digits as its factorization.

491244521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729450.

The product of its digits is 11520, while the sum is 32.

The square root of 491244521 is about 22164.0366585151. The cubic root of 491244521 is about 789.0403992458.

The spelling of 491244521 in words is "four hundred ninety-one million, two hundred forty-four thousand, five hundred twenty-one".