52185209 has 2 divisors, whose sum is σ = 52185210. Its totient is φ = 52185208.

The previous prime is 52185179. The next prime is 52185233. The reversal of 52185209 is 90258125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 6325225 = 6772^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 52185209 - 2¹² = 52181113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (52185269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26092604 + 26092605.

It is an arithmetic number, because the mean of its divisors is an integer number (26092605).

Almost surely, 2^52185209 is an apocalyptic number.

It is an amenable number.

52185209 is a deficient number, since it is larger than the sum of its proper divisors (1).

52185209 is an equidigital number, since it uses as much as digits as its factorization.

52185209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 52185209 is about 7223.9330700111. The cubic root of 52185209 is about 373.6937282127.

The spelling of 52185209 in words is "fifty-two million, one hundred eighty-five thousand, two hundred nine".