2153209 has 2 divisors, whose sum is σ = 2153210. Its totient is φ = 2153208.

The previous prime is 2153201. The next prime is 2153227. The reversal of 2153209 is 9023512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 21609 = 1460^2 + 147^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153209 - 2³ = 2153201 is a prime.

It is a super-4 number, since 4×2153209⁴ (a number of 26 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2153209.

It is not a weakly prime, because it can be changed into another prime (2153201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076604 + 1076605.

It is an arithmetic number, because the mean of its divisors is an integer number (1076605).

2^2153209 is an apocalyptic number.

It is an amenable number.

2153209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153209 is an equidigital number, since it uses as much as digits as its factorization.

2153209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2153209 is about 1467.3816817720. The cubic root of 2153209 is about 129.1304691263.

The spelling of 2153209 in words is "two million, one hundred fifty-three thousand, two hundred nine".