7982521309 has 12 divisors (see below), whose sum is σ = 9691091104. Its totient is φ = 6439679424.

The previous prime is 7982521307. The next prime is 7982521403. The reversal of 7982521309 is 9031252897.

It is not a de Polignac number, because 7982521309 - 2¹ = 7982521307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7982521307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1970919 + ... + 1974964.

Almost surely, 2^7982521309 is an apocalyptic number.

It is an amenable number.

7982521309 is a deficient number, since it is larger than the sum of its proper divisors (1708569795).

7982521309 is a wasteful number, since it uses less digits than its factorization.

7982521309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945924 (or 3945907 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 7982521309 is about 89344.9568190617. The cubic root of 7982521309 is about 1998.5423803472.

The spelling of 7982521309 in words is "seven billion, nine hundred eighty-two million, five hundred twenty-one thousand, three hundred nine".