491090 has 8 divisors (see below), whose sum is σ = 883980. Its totient is φ = 196432.

The previous prime is 491083. The next prime is 491129. The reversal of 491090 is 90194.

It can be written as a sum of positive squares in 2 ways, for example, as 458329 + 32761 = 677^2 + 181^2 .

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

It is an unprimeable number.

491090 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24545 + ... + 24564.

2⁴⁹¹⁰⁹⁰ is an apocalyptic number.

491090 is a deficient number, since it is larger than the sum of its proper divisors (392890).

491090 is a wasteful number, since it uses less digits than its factorization.

491090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49116.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 491090 is about 700.7781389284. The cubic root of 491090 is about 78.8957659665.

The spelling of 491090 in words is "four hundred ninety-one thousand, ninety".