491842837 has 2 divisors, whose sum is σ = 491842838. Its totient is φ = 491842836.

The previous prime is 491842823. The next prime is 491842853. The reversal of 491842837 is 738248194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382828356 + 109014481 = 19566^2 + 10441^2 .

It is a cyclic number.

It is not a de Polignac number, because 491842837 - 2⁷ = 491842709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491842877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245921418 + 245921419.

It is an arithmetic number, because the mean of its divisors is an integer number (245921419).

Almost surely, 2^491842837 is an apocalyptic number.

It is an amenable number.

491842837 is a deficient number, since it is larger than the sum of its proper divisors (1).

491842837 is an equidigital number, since it uses as much as digits as its factorization.

491842837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 491842837 is about 22177.5300022342. The cubic root of 491842837 is about 789.3606090670.

The spelling of 491842837 in words is "four hundred ninety-one million, eight hundred forty-two thousand, eight hundred thirty-seven".