491367893 has 2 divisors, whose sum is σ = 491367894. Its totient is φ = 491367892.

The previous prime is 491367829. The next prime is 491367907. The reversal of 491367893 is 398763194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413186929 + 78180964 = 20327^2 + 8842^2 .

It is a cyclic number.

It is not a de Polignac number, because 491367893 - 2⁶ = 491367829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491367803) 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 as a sum of consecutive naturals, namely, 245683946 + 245683947.

It is an arithmetic number, because the mean of its divisors is an integer number (245683947).

Almost surely, 2^491367893 is an apocalyptic number.

It is an amenable number.

491367893 is a deficient number, since it is larger than the sum of its proper divisors (1).

491367893 is an equidigital number, since it uses as much as digits as its factorization.

491367893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 491367893 is about 22166.8196410762. The cubic root of 491367893 is about 789.1064473746.

The spelling of 491367893 in words is "four hundred ninety-one million, three hundred sixty-seven thousand, eight hundred ninety-three".