2091717 has 8 divisors (see below), whose sum is σ = 3098880. Its totient is φ = 1394460.

The previous prime is 2091709. The next prime is 2091737. The reversal of 2091717 is 7171902.

It is not a de Polignac number, because 2091717 - 2³ = 2091709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 77471 = 2091717 / (2 + 0 + 9 + 1 + 7 + 1 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38709 + ... + 38762.

It is an arithmetic number, because the mean of its divisors is an integer number (387360).

2^2091717 is an apocalyptic number.

2091717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2091717 is a deficient number, since it is larger than the sum of its proper divisors (1007163).

2091717 is an equidigital number, since it uses as much as digits as its factorization.

2091717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77480 (or 77474 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 2091717 is about 1446.2769444335. The cubic root of 2091717 is about 127.8893289814.

It can be divided in two parts, 209 and 1717, that multiplied together give a palindrome (358853).

The spelling of 2091717 in words is "two million, ninety-one thousand, seven hundred seventeen".