201211302491 has 2 divisors, whose sum is σ = 201211302492. Its totient is φ = 201211302490.

The previous prime is 201211302449. The next prime is 201211302511. The reversal of 201211302491 is 194203112102.

201211302491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201211302491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201211302491.

It is not a weakly prime, because it can be changed into another prime (201211302421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605651245 + 100605651246.

It is an arithmetic number, because the mean of its divisors is an integer number (100605651246).

Almost surely, 2^201211302491 is an apocalyptic number.

201211302491 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211302491 is an equidigital number, since it uses as much as digits as its factorization.

201211302491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 201211302491 its reverse (194203112102), we get a palindrome (395414414593).

The spelling of 201211302491 in words is "two hundred one billion, two hundred eleven million, three hundred two thousand, four hundred ninety-one".