2117749 has 4 divisors (see below), whose sum is σ = 2129760. Its totient is φ = 2105740.

The previous prime is 2117747. The next prime is 2117777. The reversal of 2117749 is 9477112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2117749 - 2¹ = 2117747 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2117749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5737 + ... + 6094.

It is an arithmetic number, because the mean of its divisors is an integer number (532440).

2^2117749 is an apocalyptic number.

It is an amenable number.

2117749 is a deficient number, since it is larger than the sum of its proper divisors (12011).

2117749 is a wasteful number, since it uses less digits than its factorization.

2117749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12010.

The product of its digits is 3528, while the sum is 31.

The square root of 2117749 is about 1455.2487759830. The cubic root of 2117749 is about 128.4176825963.

The spelling of 2117749 in words is "two million, one hundred seventeen thousand, seven hundred forty-nine".