491242895 has 64 divisors (see below), whose sum is σ = 735436800. Its totient is φ = 310003200.

The previous prime is 491242883. The next prime is 491242933. The reversal of 491242895 is 598242194.

It is a Cunningham number, because it is equal to 22164²-1.

It is not a de Polignac number, because 491242895 - 2⁶ = 491242831 is a prime.

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 in 63 ways as a sum of consecutive naturals, for example, 819806 + ... + 820404.

It is an arithmetic number, because the mean of its divisors is an integer number (11491200).

Almost surely, 2^491242895 is an apocalyptic number.

491242895 is a deficient number, since it is larger than the sum of its proper divisors (244193905).

491242895 is a wasteful number, since it uses less digits than its factorization.

491242895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its digits is 207360, while the sum is 44.

The square root of 491242895 is about 22163.9999774409. Note that the first 4 decimals coincide. The cubic root of 491242895 is about 789.0395286807.

The spelling of 491242895 in words is "four hundred ninety-one million, two hundred forty-two thousand, eight hundred ninety-five".