491649727 has 2 divisors, whose sum is σ = 491649728. Its totient is φ = 491649726.

The previous prime is 491649721. The next prime is 491649761. The reversal of 491649727 is 727946194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491649727 - 2¹⁵ = 491616959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491649721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245824863 + 245824864.

It is an arithmetic number, because the mean of its divisors is an integer number (245824864).

Almost surely, 2^491649727 is an apocalyptic number.

491649727 is a deficient number, since it is larger than the sum of its proper divisors (1).

491649727 is an equidigital number, since it uses as much as digits as its factorization.

491649727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 491649727 is about 22173.1758437983. The cubic root of 491649727 is about 789.2572878637.

The spelling of 491649727 in words is "four hundred ninety-one million, six hundred forty-nine thousand, seven hundred twenty-seven".