2091797 has 2 divisors, whose sum is σ = 2091798. Its totient is φ = 2091796.

The previous prime is 2091773. The next prime is 2091809. The reversal of 2091797 is 7971902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 857476 = 1111^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091797 - 2²⁰ = 1043221 is a prime.

It is a super-2 number, since 2×2091797² = 8751229378418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045898 + 1045899.

It is an arithmetic number, because the mean of its divisors is an integer number (1045899).

2^2091797 is an apocalyptic number.

It is an amenable number.

2091797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091797 is an equidigital number, since it uses as much as digits as its factorization.

2091797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 2091797 is about 1446.3046013893. The cubic root of 2091797 is about 127.8909593830.

It can be divided in two parts, 209 and 1797, that multiplied together give a palindrome (375573).

The spelling of 2091797 in words is "two million, ninety-one thousand, seven hundred ninety-seven".