491753581169 has 2 divisors, whose sum is σ = 491753581170. Its totient is φ = 491753581168.

The previous prime is 491753581153. The next prime is 491753581181. The reversal of 491753581169 is 961185357194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 460854972769 + 30898608400 = 678863^2 + 175780^2 .

It is a cyclic number.

It is not a de Polignac number, because 491753581169 - 2⁴ = 491753581153 is a prime.

It is a super-2 number, since 2×491753581169² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491753581069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245876790584 + 245876790585.

It is an arithmetic number, because the mean of its divisors is an integer number (245876790585).

Almost surely, 2^491753581169 is an apocalyptic number.

It is an amenable number.

491753581169 is a deficient number, since it is larger than the sum of its proper divisors (1).

491753581169 is an equidigital number, since it uses as much as digits as its factorization.

491753581169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 59.

The spelling of 491753581169 in words is "four hundred ninety-one billion, seven hundred fifty-three million, five hundred eighty-one thousand, one hundred sixty-nine".