491646599 has 16 divisors (see below), whose sum is σ = 518404320. Its totient is φ = 465628800.

The previous prime is 491646593. The next prime is 491646607. The reversal of 491646599 is 995646194.

It is a cyclic number.

It is not a de Polignac number, because 491646599 - 2⁴ = 491646583 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 491646599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491646593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377249 + ... + 378549.

It is an arithmetic number, because the mean of its divisors is an integer number (32400270).

Almost surely, 2^491646599 is an apocalyptic number.

491646599 is a deficient number, since it is larger than the sum of its proper divisors (26757721).

491646599 is a wasteful number, since it uses less digits than its factorization.

491646599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570.

The product of its digits is 2099520, while the sum is 53.

The square root of 491646599 is about 22173.1053080077. The cubic root of 491646599 is about 789.2556140419.

It can be divided in two parts, 4916 and 46599, that added together give a palindrome (51515).

The spelling of 491646599 in words is "four hundred ninety-one million, six hundred forty-six thousand, five hundred ninety-nine".