1291117 has 2 divisors, whose sum is σ = 1291118. Its totient is φ = 1291116.

The previous prime is 1291111. The next prime is 1291139. The reversal of 1291117 is 7111921.

It is an a-pointer prime, because the next prime (1291139) can be obtained adding 1291117 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153476 + 137641 = 1074^2 + 371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291117 - 2¹⁵ = 1258349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291111) 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, 645558 + 645559.

It is an arithmetic number, because the mean of its divisors is an integer number (645559).

2^1291117 is an apocalyptic number.

It is an amenable number.

1291117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291117 is an equidigital number, since it uses as much as digits as its factorization.

1291117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 22.

The square root of 1291117 is about 1136.2732945907. The cubic root of 1291117 is about 108.8901342277.

The spelling of 1291117 in words is "one million, two hundred ninety-one thousand, one hundred seventeen".