491171031 has 24 divisors (see below), whose sum is σ = 765369696. Its totient is φ = 301734720.

The previous prime is 491171029. The next prime is 491171039. The reversal of 491171031 is 130171194.

491171031 is a `hidden beast` number, since 491 + 171 + 0 + 3 + 1 = 666.

It is not a de Polignac number, because 491171031 - 2¹ = 491171029 is a prime.

It is a super-2 number, since 2×491171031² = 482497963387205922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 491170986 and 491171004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491171039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70501 + ... + 77153.

It is an arithmetic number, because the mean of its divisors is an integer number (31890404).

Almost surely, 2^491171031 is an apocalyptic number.

491171031 is a deficient number, since it is larger than the sum of its proper divisors (274198665).

491171031 is a wasteful number, since it uses less digits than its factorization.

491171031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7303 (or 7300 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 491171031 is about 22162.3787306327. The cubic root of 491171031 is about 789.0010505656.

The spelling of 491171031 in words is "four hundred ninety-one million, one hundred seventy-one thousand, thirty-one".