5211209 has 2 divisors, whose sum is σ = 5211210. Its totient is φ = 5211208.

The previous prime is 5211109. The next prime is 5211211. The reversal of 5211209 is 9021125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4826809 + 384400 = 2197^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 5211209 - 2¹² = 5207113 is a prime.

Together with 5211211, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₃₆₂₁₃₅ and since 5211209 and 362135 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (5211229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605604 + 2605605.

It is an arithmetic number, because the mean of its divisors is an integer number (2605605).

Almost surely, 2^5211209 is an apocalyptic number.

It is an amenable number.

5211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211209 is an equidigital number, since it uses as much as digits as its factorization.

5211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 5211209 is about 2282.8072629988. The cubic root of 5211209 is about 173.3722147326.

The spelling of 5211209 in words is "five million, two hundred eleven thousand, two hundred nine".