491235647 has 4 divisors (see below), whose sum is σ = 561412176. Its totient is φ = 421059120.

The previous prime is 491235631. The next prime is 491235649. The reversal of 491235647 is 746532194.

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 491235647 - 2⁴ = 491235631 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 (491235649) 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, 35088254 + ... + 35088267.

It is an arithmetic number, because the mean of its divisors is an integer number (140353044).

Almost surely, 2^491235647 is an apocalyptic number.

491235647 is a deficient number, since it is larger than the sum of its proper divisors (70176529).

491235647 is an equidigital number, since it uses as much as digits as its factorization.

491235647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70176528.

The product of its digits is 181440, while the sum is 41.

The square root of 491235647 is about 22163.8364684456. The cubic root of 491235647 is about 789.0356480569.

The spelling of 491235647 in words is "four hundred ninety-one million, two hundred thirty-five thousand, six hundred forty-seven".