491076591 has 8 divisors (see below), whose sum is σ = 657654144. Its totient is φ = 325941720.

The previous prime is 491076587. The next prime is 491076623. The reversal of 491076591 is 195670194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491076591 - 2² = 491076587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491076571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359875 + ... + 361236.

It is an arithmetic number, because the mean of its divisors is an integer number (82206768).

Almost surely, 2^491076591 is an apocalyptic number.

491076591 is a deficient number, since it is larger than the sum of its proper divisors (166577553).

491076591 is a wasteful number, since it uses less digits than its factorization.

491076591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721341.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 491076591 is about 22160.2479904896. The cubic root of 491076591 is about 788.9504788837.

The spelling of 491076591 in words is "four hundred ninety-one million, seventy-six thousand, five hundred ninety-one".