491305999 has 4 divisors (see below), whose sum is σ = 491931064. Its totient is φ = 490680936.

The previous prime is 491305979. The next prime is 491306027. The reversal of 491305999 is 999503194.

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 491305999 - 2¹¹ = 491303951 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 (491305939) 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, 311352 + ... + 312925.

It is an arithmetic number, because the mean of its divisors is an integer number (122982766).

Almost surely, 2^491305999 is an apocalyptic number.

491305999 is a deficient number, since it is larger than the sum of its proper divisors (625065).

491305999 is an equidigital number, since it uses as much as digits as its factorization.

491305999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625064.

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 491305999 is about 22165.4235014809. The cubic root of 491305999 is about 789.0733133379.

The spelling of 491305999 in words is "four hundred ninety-one million, three hundred five thousand, nine hundred ninety-nine".