525250009 has 2 divisors, whose sum is σ = 525250010. Its totient is φ = 525250008.

The previous prime is 525249997. The next prime is 525250013. The reversal of 525250009 is 900052525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455694409 + 69555600 = 21347^2 + 8340^2 .

It is a cyclic number.

It is not a de Polignac number, because 525250009 - 2⁹ = 525249497 is a prime.

It is not a weakly prime, because it can be changed into another prime (525250069) 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, 262625004 + 262625005.

It is an arithmetic number, because the mean of its divisors is an integer number (262625005).

Almost surely, 2^525250009 is an apocalyptic number.

It is an amenable number.

525250009 is a deficient number, since it is larger than the sum of its proper divisors (1).

525250009 is an equidigital number, since it uses as much as digits as its factorization.

525250009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 525250009 is about 22918.3334690810. Note that the first 3 decimals coincide. The cubic root of 525250009 is about 806.8423571931.

The spelling of 525250009 in words is "five hundred twenty-five million, two hundred fifty thousand, nine".