491580086 has 4 divisors (see below), whose sum is σ = 737370132. Its totient is φ = 245790042.

The previous prime is 491580059. The next prime is 491580121. The reversal of 491580086 is 680085194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 680085194 = 2 ⋅340042597.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122895020 + ... + 122895023.

It is an arithmetic number, because the mean of its divisors is an integer number (184342533).

Almost surely, 2^491580086 is an apocalyptic number.

491580086 is a deficient number, since it is larger than the sum of its proper divisors (245790046).

491580086 is a wasteful number, since it uses less digits than its factorization.

491580086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245790045.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 491580086 is about 22171.6053996999. The cubic root of 491580086 is about 789.2200206392.

The spelling of 491580086 in words is "four hundred ninety-one million, five hundred eighty thousand, eighty-six".