2637221 has 2 divisors, whose sum is σ = 2637222. Its totient is φ = 2637220.

The previous prime is 2637209. The next prime is 2637251. The reversal of 2637221 is 1227362.

2637221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 429025 = 1486^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 2637221 - 2¹⁰ = 2636197 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (2637251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318610 + 1318611.

It is an arithmetic number, because the mean of its divisors is an integer number (1318611).

2^2637221 is an apocalyptic number.

It is an amenable number.

2637221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2637221 is an equidigital number, since it uses as much as digits as its factorization.

2637221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 2637221 is about 1623.9522776239. The cubic root of 2637221 is about 138.1599524576.

The spelling of 2637221 in words is "two million, six hundred thirty-seven thousand, two hundred twenty-one".