491335563293 has 2 divisors, whose sum is σ = 491335563294. Its totient is φ = 491335563292.

The previous prime is 491335563233. The next prime is 491335563311. The reversal of 491335563293 is 392365533194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490186217689 + 1149345604 = 700133^2 + 33902^2 .

It is a cyclic number.

It is not a de Polignac number, because 491335563293 - 2¹⁰ = 491335562269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491335563233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245667781646 + 245667781647.

It is an arithmetic number, because the mean of its divisors is an integer number (245667781647).

Almost surely, 2^491335563293 is an apocalyptic number.

It is an amenable number.

491335563293 is a deficient number, since it is larger than the sum of its proper divisors (1).

491335563293 is an equidigital number, since it uses as much as digits as its factorization.

491335563293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 53.

The spelling of 491335563293 in words is "four hundred ninety-one billion, three hundred thirty-five million, five hundred sixty-three thousand, two hundred ninety-three".