491231943 has 24 divisors (see below), whose sum is σ = 733032768. Its totient is φ = 316757952.

The previous prime is 491231941. The next prime is 491231969. The reversal of 491231943 is 349132194.

It is not a de Polignac number, because 491231943 - 2¹ = 491231941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491231898 and 491231907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491231941) 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, 53346 + ... + 61872.

It is an arithmetic number, because the mean of its divisors is an integer number (30543032).

Almost surely, 2^491231943 is an apocalyptic number.

491231943 is a deficient number, since it is larger than the sum of its proper divisors (241800825).

491231943 is a wasteful number, since it uses less digits than its factorization.

491231943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743 (or 8740 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 491231943 is about 22163.7529087472. The cubic root of 491231943 is about 789.0336648977.

The spelling of 491231943 in words is "four hundred ninety-one million, two hundred thirty-one thousand, nine hundred forty-three".