52521809 has 2 divisors, whose sum is σ = 52521810. Its totient is φ = 52521808.

The previous prime is 52521803. The next prime is 52521817. The reversal of 52521809 is 90812525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47886400 + 4635409 = 6920^2 + 2153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52521809 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 (52521803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26260904 + 26260905.

It is an arithmetic number, because the mean of its divisors is an integer number (26260905).

Almost surely, 2^52521809 is an apocalyptic number.

It is an amenable number.

52521809 is a deficient number, since it is larger than the sum of its proper divisors (1).

52521809 is an equidigital number, since it uses as much as digits as its factorization.

52521809 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 52521809 is about 7247.1931808115. The cubic root of 52521809 is about 374.4954613316.

The spelling of 52521809 in words is "fifty-two million, five hundred twenty-one thousand, eight hundred nine".