2091317 has 2 divisors, whose sum is σ = 2091318. Its totient is φ = 2091316.

The previous prime is 2091301. The next prime is 2091319. The reversal of 2091317 is 7131902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874161 + 217156 = 1369^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091317 - 2⁴ = 2091301 is a prime.

Together with 2091319, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2091292 and 2091301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045658 + 1045659.

It is an arithmetic number, because the mean of its divisors is an integer number (1045659).

2^2091317 is an apocalyptic number.

It is an amenable number.

2091317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091317 is an equidigital number, since it uses as much as digits as its factorization.

2091317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 2091317 is about 1446.1386517205. The cubic root of 2091317 is about 127.8811763501.

The spelling of 2091317 in words is "two million, ninety-one thousand, three hundred seventeen".