491071943 has 2 divisors, whose sum is σ = 491071944. Its totient is φ = 491071942.

The previous prime is 491071939. The next prime is 491071969. The reversal of 491071943 is 349170194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491071943 - 2² = 491071939 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 491071897 and 491071906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491071543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245535971 + 245535972.

It is an arithmetic number, because the mean of its divisors is an integer number (245535972).

Almost surely, 2^491071943 is an apocalyptic number.

491071943 is a deficient number, since it is larger than the sum of its proper divisors (1).

491071943 is an equidigital number, since it uses as much as digits as its factorization.

491071943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 491071943 is about 22160.1431177689. The cubic root of 491071943 is about 788.9479897584.

The spelling of 491071943 in words is "four hundred ninety-one million, seventy-one thousand, nine hundred forty-three".