491718331 has 8 divisors (see below), whose sum is σ = 538518960. Its totient is φ = 446200032.

The previous prime is 491718323. The next prime is 491718341. The reversal of 491718331 is 133817194.

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

It is a cyclic number.

It is not a de Polignac number, because 491718331 - 2³ = 491718323 is a prime.

It is a super-2 number, since 2×491718331² = 483573834082851122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491718301) 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 7 ways as a sum of consecutive naturals, for example, 319780 + ... + 321313.

It is an arithmetic number, because the mean of its divisors is an integer number (67314870).

Almost surely, 2^491718331 is an apocalyptic number.

491718331 is a deficient number, since it is larger than the sum of its proper divisors (46800629).

491718331 is a wasteful number, since it uses less digits than its factorization.

491718331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641165.

The product of its digits is 18144, while the sum is 37.

The square root of 491718331 is about 22174.7227942087. The cubic root of 491718331 is about 789.2939967140.

The spelling of 491718331 in words is "four hundred ninety-one million, seven hundred eighteen thousand, three hundred thirty-one".