2189521 has 2 divisors, whose sum is σ = 2189522. Its totient is φ = 2189520.

The previous prime is 2189513. The next prime is 2189533. The reversal of 2189521 is 1259812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143296 + 46225 = 1464^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189521 - 2³ = 2189513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2189521.

It is not a weakly prime, because it can be changed into another prime (2189021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094760 + 1094761.

It is an arithmetic number, because the mean of its divisors is an integer number (1094761).

2^2189521 is an apocalyptic number.

It is an amenable number.

2189521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189521 is an equidigital number, since it uses as much as digits as its factorization.

2189521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 2189521 is about 1479.7030107424. The cubic root of 2189521 is about 129.8523175005.

The spelling of 2189521 in words is "two million, one hundred eighty-nine thousand, five hundred twenty-one".