526449509 has 2 divisors, whose sum is σ = 526449510. Its totient is φ = 526449508.

The previous prime is 526449481. The next prime is 526449527. The reversal of 526449509 is 905944625.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456676900 + 69772609 = 21370^2 + 8353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-526449509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 526449509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (526449529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263224754 + 263224755.

It is an arithmetic number, because the mean of its divisors is an integer number (263224755).

Almost surely, 2^526449509 is an apocalyptic number.

It is an amenable number.

526449509 is a deficient number, since it is larger than the sum of its proper divisors (1).

526449509 is an equidigital number, since it uses as much as digits as its factorization.

526449509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 526449509 is about 22944.4875514795. The cubic root of 526449509 is about 807.4560786624.

The spelling of 526449509 in words is "five hundred twenty-six million, four hundred forty-nine thousand, five hundred nine".