491164090499 has 2 divisors, whose sum is σ = 491164090500. Its totient is φ = 491164090498.

The previous prime is 491164090493. The next prime is 491164090579. The reversal of 491164090499 is 994090461194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491164090499 - 2¹² = 491164086403 is a prime.

It is not a weakly prime, because it can be changed into another prime (491164090493) 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, 245582045249 + 245582045250.

It is an arithmetic number, because the mean of its divisors is an integer number (245582045250).

Almost surely, 2^491164090499 is an apocalyptic number.

491164090499 is a deficient number, since it is larger than the sum of its proper divisors (1).

491164090499 is an equidigital number, since it uses as much as digits as its factorization.

491164090499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 491164090499 in words is "four hundred ninety-one billion, one hundred sixty-four million, ninety thousand, four hundred ninety-nine".