2126549 has 2 divisors, whose sum is σ = 2126550. Its totient is φ = 2126548.

The previous prime is 2126539. The next prime is 2126567. The reversal of 2126549 is 9456212.

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., 1643524 + 483025 = 1282^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126549 - 2¹⁶ = 2061013 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 (2126539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063274 + 1063275.

It is an arithmetic number, because the mean of its divisors is an integer number (1063275).

2^2126549 is an apocalyptic number.

It is an amenable number.

2126549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126549 is an equidigital number, since it uses as much as digits as its factorization.

2126549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 2126549 is about 1458.2691795413. The cubic root of 2126549 is about 128.5953104961.

The spelling of 2126549 in words is "two million, one hundred twenty-six thousand, five hundred forty-nine".