491570 has 8 divisors (see below), whose sum is σ = 884844. Its totient is φ = 196624.

The previous prime is 491539. The next prime is 491581. The reversal of 491570 is 75194.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 169 = 701^2 + 13^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24569 + ... + 24588.

2⁴⁹¹⁵⁷⁰ is an apocalyptic number.

491570 is a deficient number, since it is larger than the sum of its proper divisors (393274).

491570 is a wasteful number, since it uses less digits than its factorization.

491570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49164.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 491570 is about 701.1205317205. The cubic root of 491570 is about 78.9214622992.

The spelling of 491570 in words is "four hundred ninety-one thousand, five hundred seventy".