491690 has 8 divisors (see below), whose sum is σ = 885060. Its totient is φ = 196672.

The previous prime is 491677. The next prime is 491707. The reversal of 491690 is 96194.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 289 = 701^2 + 17^2 .

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

It is a super-2 number, since 2×491690² = 483518112200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24575 + ... + 24594.

2⁴⁹¹⁶⁹⁰ is an apocalyptic number.

491690 is a deficient number, since it is larger than the sum of its proper divisors (393370).

491690 is a wasteful number, since it uses less digits than its factorization.

491690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49176.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 491690 is about 701.2061037955. The cubic root of 491690 is about 78.9278837685.

The spelling of 491690 in words is "four hundred ninety-one thousand, six hundred ninety".