491806597 has 4 divisors (see below), whose sum is σ = 491965056. Its totient is φ = 491648140.

The previous prime is 491806591. The next prime is 491806633. The reversal of 491806597 is 795608194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491806597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491806597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491806591) 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, 74479 + ... + 80812.

It is an arithmetic number, because the mean of its divisors is an integer number (122991264).

Almost surely, 2^491806597 is an apocalyptic number.

It is an amenable number.

491806597 is a deficient number, since it is larger than the sum of its proper divisors (158459).

491806597 is a wasteful number, since it uses less digits than its factorization.

491806597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158458.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 491806597 is about 22176.7129439870. The cubic root of 491806597 is about 789.3412213487.

The spelling of 491806597 in words is "four hundred ninety-one million, eight hundred six thousand, five hundred ninety-seven".