491290 has 16 divisors (see below), whose sum is σ = 897768. Its totient is φ = 193536.

The previous prime is 491279. The next prime is 491297. The reversal of 491290 is 92194.

It can be written as a sum of positive squares in 4 ways, for example, as 370881 + 120409 = 609^2 + 347^2 .

It is not an unprimeable number, because it can be changed into a prime (491297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394 + ... + 1066.

2⁴⁹¹²⁹⁰ is an apocalyptic number.

491290 is a deficient number, since it is larger than the sum of its proper divisors (406478).

491290 is a wasteful number, since it uses less digits than its factorization.

491290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 491290 is about 700.9208229180. The cubic root of 491290 is about 78.9064748058.

The spelling of 491290 in words is "four hundred ninety-one thousand, two hundred ninety".