491530831 has 8 divisors (see below), whose sum is σ = 554706000. Its totient is φ = 431437440.

The previous prime is 491530801. The next prime is 491530847. The reversal of 491530831 is 138035194.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491530831 is a prime.

It is a super-2 number, since 2×491530831² = 483205115647101122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491530801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770106 + ... + 770743.

It is an arithmetic number, because the mean of its divisors is an integer number (69338250).

Almost surely, 2^491530831 is an apocalyptic number.

491530831 is a deficient number, since it is larger than the sum of its proper divisors (63175169).

491530831 is a wasteful number, since it uses less digits than its factorization.

491530831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540889.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 491530831 is about 22170.4946043159. The cubic root of 491530831 is about 789.1936605190.

The spelling of 491530831 in words is "four hundred ninety-one million, five hundred thirty thousand, eight hundred thirty-one".