525257209 has 2 divisors, whose sum is σ = 525257210. Its totient is φ = 525257208.

The previous prime is 525257171. The next prime is 525257303. The reversal of 525257209 is 902752525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449567209 + 75690000 = 21203^2 + 8700^2 .

It is a cyclic number.

It is not a de Polignac number, because 525257209 - 2⁷ = 525257081 is a prime.

It is not a weakly prime, because it can be changed into another prime (525257009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262628604 + 262628605.

It is an arithmetic number, because the mean of its divisors is an integer number (262628605).

Almost surely, 2^525257209 is an apocalyptic number.

It is an amenable number.

525257209 is a deficient number, since it is larger than the sum of its proper divisors (1).

525257209 is an equidigital number, since it uses as much as digits as its factorization.

525257209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 525257209 is about 22918.4905480269. The cubic root of 525257209 is about 806.8460438429.

The spelling of 525257209 in words is "five hundred twenty-five million, two hundred fifty-seven thousand, two hundred nine".