491318593 has 2 divisors, whose sum is σ = 491318594. Its totient is φ = 491318592.

The previous prime is 491318567. The next prime is 491318627. The reversal of 491318593 is 395813194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459373489 + 31945104 = 21433^2 + 5652^2 .

It is a cyclic number.

It is not a de Polignac number, because 491318593 - 2⁵ = 491318561 is a prime.

It is not a weakly prime, because it can be changed into another prime (491310593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245659296 + 245659297.

It is an arithmetic number, because the mean of its divisors is an integer number (245659297).

Almost surely, 2^491318593 is an apocalyptic number.

It is an amenable number.

491318593 is a deficient number, since it is larger than the sum of its proper divisors (1).

491318593 is an equidigital number, since it uses as much as digits as its factorization.

491318593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 491318593 is about 22165.7075907809. The cubic root of 491318593 is about 789.0800555749.

The spelling of 491318593 in words is "four hundred ninety-one million, three hundred eighteen thousand, five hundred ninety-three".