491138 has 8 divisors (see below), whose sum is σ = 756732. Its totient is φ = 238896.

The previous prime is 491137. The next prime is 491149. The reversal of 491138 is 831194.

It can be written as a sum of positive squares in 2 ways, for example, as 485809 + 5329 = 697^2 + 73^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (491137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245 + ... + 3392.

2⁴⁹¹¹³⁸ is an apocalyptic number.

491138 is a deficient number, since it is larger than the sum of its proper divisors (265594).

491138 is a wasteful number, since it uses less digits than its factorization.

491138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676.

The product of its digits is 864, while the sum is 26.

The square root of 491138 is about 700.8123857353. The cubic root of 491138 is about 78.8983363530.

The spelling of 491138 in words is "four hundred ninety-one thousand, one hundred thirty-eight".