2169749 has 2 divisors, whose sum is σ = 2169750. Its totient is φ = 2169748.

The previous prime is 2169707. The next prime is 2169757. The reversal of 2169749 is 9479612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 669124 = 1225^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 2169749 - 2¹⁶ = 2104213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2169799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084874 + 1084875.

It is an arithmetic number, because the mean of its divisors is an integer number (1084875).

2^2169749 is an apocalyptic number.

It is an amenable number.

2169749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169749 is an equidigital number, since it uses as much as digits as its factorization.

2169749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 2169749 is about 1473.0067888506. The cubic root of 2169749 is about 129.4602671743.

The spelling of 2169749 in words is "two million, one hundred sixty-nine thousand, seven hundred forty-nine".