1091917 has 2 divisors, whose sum is σ = 1091918. Its totient is φ = 1091916.

The previous prime is 1091887. The next prime is 1091939. The reversal of 1091917 is 7191901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799236 + 292681 = 894^2 + 541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545958 + 545959.

It is an arithmetic number, because the mean of its divisors is an integer number (545959).

2^1091917 is an apocalyptic number.

It is an amenable number.

1091917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091917 is an equidigital number, since it uses as much as digits as its factorization.

1091917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 1091917 is about 1044.9483240811. The cubic root of 1091917 is about 102.9745436194.

The spelling of 1091917 in words is "one million, ninety-one thousand, nine hundred seventeen".