491442841 has 2 divisors, whose sum is σ = 491442842. Its totient is φ = 491442840.

The previous prime is 491442821. The next prime is 491442859. The reversal of 491442841 is 148244194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487526400 + 3916441 = 22080^2 + 1979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491442841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491442841.

It is not a weakly prime, because it can be changed into another prime (491442811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245721420 + 245721421.

It is an arithmetic number, because the mean of its divisors is an integer number (245721421).

Almost surely, 2^491442841 is an apocalyptic number.

It is an amenable number.

491442841 is a deficient number, since it is larger than the sum of its proper divisors (1).

491442841 is an equidigital number, since it uses as much as digits as its factorization.

491442841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 37.

The square root of 491442841 is about 22168.5101213410. The cubic root of 491442841 is about 789.1465659525.

The spelling of 491442841 in words is "four hundred ninety-one million, four hundred forty-two thousand, eight hundred forty-one".