491548791 has 12 divisors (see below), whose sum is σ = 691710072. Its totient is φ = 310451184.

The previous prime is 491548787. The next prime is 491548807. The reversal of 491548791 is 197845194.

It is not a de Polignac number, because 491548791 - 2² = 491548787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491548791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491548721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225856 + ... + 228021.

It is an arithmetic number, because the mean of its divisors is an integer number (57642506).

Almost surely, 2^491548791 is an apocalyptic number.

491548791 is a deficient number, since it is larger than the sum of its proper divisors (200161281).

491548791 is a wasteful number, since it uses less digits than its factorization.

491548791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453918 (or 453899 counting only the distinct ones).

The product of its digits is 362880, while the sum is 48.

The square root of 491548791 is about 22170.8996434515. The cubic root of 491548791 is about 789.2032724935.

The spelling of 491548791 in words is "four hundred ninety-one million, five hundred forty-eight thousand, seven hundred ninety-one".