1291211 has 2 divisors, whose sum is σ = 1291212. Its totient is φ = 1291210.

The previous prime is 1291193. The next prime is 1291217. The reversal of 1291211 is 1121921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291211.

It is not a weakly prime, because it can be changed into another prime (1291217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645605 + 645606.

It is an arithmetic number, because the mean of its divisors is an integer number (645606).

2^1291211 is an apocalyptic number.

1291211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291211 is an equidigital number, since it uses as much as digits as its factorization.

1291211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

The square root of 1291211 is about 1136.3146571263. The cubic root of 1291211 is about 108.8927767520.

The spelling of 1291211 in words is "one million, two hundred ninety-one thousand, two hundred eleven".