491380447 has 4 divisors (see below), whose sum is σ = 498111760. Its totient is φ = 484649136.

The previous prime is 491380433. The next prime is 491380459. The reversal of 491380447 is 744083194.

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

It is a cyclic number.

It is not a de Polignac number, because 491380447 - 2¹⁹ = 490856159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491380247) 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, 3365547 + ... + 3365692.

It is an arithmetic number, because the mean of its divisors is an integer number (124527940).

Almost surely, 2^491380447 is an apocalyptic number.

491380447 is a deficient number, since it is larger than the sum of its proper divisors (6731313).

491380447 is an equidigital number, since it uses as much as digits as its factorization.

491380447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731312.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 491380447 is about 22167.1028102456. The cubic root of 491380447 is about 789.1131676332.

The spelling of 491380447 in words is "four hundred ninety-one million, three hundred eighty thousand, four hundred forty-seven".