2091917 has 2 divisors, whose sum is σ = 2091918. Its totient is φ = 2091916.

The previous prime is 2091913. The next prime is 2091931. The reversal of 2091917 is 7191902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1771561 + 320356 = 1331^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091917 - 2² = 2091913 is a prime.

It is a super-2 number, since 2×2091917² = 8752233469778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2091917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045958 + 1045959.

It is an arithmetic number, because the mean of its divisors is an integer number (1045959).

2^2091917 is an apocalyptic number.

It is an amenable number.

2091917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091917 is an equidigital number, since it uses as much as digits as its factorization.

2091917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 2091917 is about 1446.3460858315. The cubic root of 2091917 is about 127.8934049073.

The spelling of 2091917 in words is "two million, ninety-one thousand, nine hundred seventeen".