491980459 has 4 divisors (see below), whose sum is σ = 520920504. Its totient is φ = 463040416.

The previous prime is 491980451. The next prime is 491980469. The reversal of 491980459 is 954089194.

It is a happy number.

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 491980459 - 2³ = 491980451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491980451) 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, 14469997 + ... + 14470030.

It is an arithmetic number, because the mean of its divisors is an integer number (130230126).

Almost surely, 2^491980459 is an apocalyptic number.

491980459 is a deficient number, since it is larger than the sum of its proper divisors (28940045).

491980459 is a wasteful number, since it uses less digits than its factorization.

491980459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28940044.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 491980459 is about 22180.6325202867. The cubic root of 491980459 is about 789.4342255741.

The spelling of 491980459 in words is "four hundred ninety-one million, nine hundred eighty thousand, four hundred fifty-nine".