491131594137599 has 2 divisors, whose sum is σ = 491131594137600. Its totient is φ = 491131594137598.

The previous prime is 491131594137533. The next prime is 491131594137641. The reversal of 491131594137599 is 995731495131194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491131594137599 - 2²⁴ = 491131577360383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491131594137529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245565797068799 + 245565797068800.

It is an arithmetic number, because the mean of its divisors is an integer number (245565797068800).

Almost surely, 2^{491131594137599} is an apocalyptic number.

491131594137599 is a deficient number, since it is larger than the sum of its proper divisors (1).

491131594137599 is an equidigital number, since it uses as much as digits as its factorization.

491131594137599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165337200, while the sum is 71.

The spelling of 491131594137599 in words is "four hundred ninety-one trillion, one hundred thirty-one billion, five hundred ninety-four million, one hundred thirty-seven thousand, five hundred ninety-nine".