491131 has 4 divisors (see below), whose sum is σ = 517000. Its totient is φ = 465264.

The previous prime is 491129. The next prime is 491137. The reversal of 491131 is 131194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491131 - 2¹ = 491129 is a prime.

It is a super-2 number, since 2×491131² = 482419318322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 25849 = 491131 / (4 + 9 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491099 and 491108.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12906 + ... + 12943.

It is an arithmetic number, because the mean of its divisors is an integer number (129250).

2⁴⁹¹¹³¹ is an apocalyptic number.

491131 is a deficient number, since it is larger than the sum of its proper divisors (25869).

491131 is a wasteful number, since it uses less digits than its factorization.

491131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25868.

The product of its digits is 108, while the sum is 19.

The square root of 491131 is about 700.8073915135. The cubic root of 491131 is about 78.8979615154.

The spelling of 491131 in words is "four hundred ninety-one thousand, one hundred thirty-one".