52217309 has 2 divisors, whose sum is σ = 52217310. Its totient is φ = 52217308.

The previous prime is 52217293. The next prime is 52217311. The reversal of 52217309 is 90371225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52157284 + 60025 = 7222^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 52217309 - 2⁴ = 52217293 is a prime.

Together with 52217311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52217509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26108654 + 26108655.

It is an arithmetic number, because the mean of its divisors is an integer number (26108655).

Almost surely, 2^52217309 is an apocalyptic number.

It is an amenable number.

52217309 is a deficient number, since it is larger than the sum of its proper divisors (1).

52217309 is an equidigital number, since it uses as much as digits as its factorization.

52217309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 52217309 is about 7226.1545098344. The cubic root of 52217309 is about 373.7703342740.

The spelling of 52217309 in words is "fifty-two million, two hundred seventeen thousand, three hundred nine".