1521485509 has 2 divisors, whose sum is σ = 1521485510. Its totient is φ = 1521485508.

The previous prime is 1521485507. The next prime is 1521485519. The reversal of 1521485509 is 9055841251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810996484 + 710489025 = 28478^2 + 26655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521485509 - 2¹ = 1521485507 is a prime.

Together with 1521485507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521485503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760742754 + 760742755.

It is an arithmetic number, because the mean of its divisors is an integer number (760742755).

Almost surely, 2^1521485509 is an apocalyptic number.

It is an amenable number.

1521485509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521485509 is an equidigital number, since it uses as much as digits as its factorization.

1521485509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 40.

The square root of 1521485509 is about 39006.2239777192. The cubic root of 1521485509 is about 1150.1538569195.

The spelling of 1521485509 in words is "one billion, five hundred twenty-one million, four hundred eighty-five thousand, five hundred nine".