291968265209 has 2 divisors, whose sum is σ = 291968265210. Its totient is φ = 291968265208.

The previous prime is 291968265191. The next prime is 291968265217. The reversal of 291968265209 is 902562869192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177196376809 + 114771888400 = 420947^2 + 338780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291968265209 is a prime.

It is not a weakly prime, because it can be changed into another prime (291968265709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145984132604 + 145984132605.

It is an arithmetic number, because the mean of its divisors is an integer number (145984132605).

Almost surely, 2^291968265209 is an apocalyptic number.

It is an amenable number.

291968265209 is a deficient number, since it is larger than the sum of its proper divisors (1).

291968265209 is an equidigital number, since it uses as much as digits as its factorization.

291968265209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 291968265209 in words is "two hundred ninety-one billion, nine hundred sixty-eight million, two hundred sixty-five thousand, two hundred nine".