2291749 has 2 divisors, whose sum is σ = 2291750. Its totient is φ = 2291748.

The previous prime is 2291747. The next prime is 2291797. The reversal of 2291749 is 9471922.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 174724 = 1455^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291749 - 2¹ = 2291747 is a prime.

It is a super-2 number, since 2×2291749² = 10504226958002, which contains 22 as substring.

Together with 2291747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2291747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145874 + 1145875.

It is an arithmetic number, because the mean of its divisors is an integer number (1145875).

2^2291749 is an apocalyptic number.

It is an amenable number.

2291749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291749 is an equidigital number, since it uses as much as digits as its factorization.

2291749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 2291749 is about 1513.8523706095. The cubic root of 2291749 is about 131.8425771013.

The spelling of 2291749 in words is "two million, two hundred ninety-one thousand, seven hundred forty-nine".