7995138509 has 4 divisors (see below), whose sum is σ = 8005298304. Its totient is φ = 7984978716.

The previous prime is 7995138449. The next prime is 7995138521. The reversal of 7995138509 is 9058315997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7995138509 - 2⁸ = 7995138253 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 (7995138589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5078717 + ... + 5080290.

It is an arithmetic number, because the mean of its divisors is an integer number (2001324576).

Almost surely, 2^7995138509 is an apocalyptic number.

It is an amenable number.

7995138509 is a deficient number, since it is larger than the sum of its proper divisors (10159795).

7995138509 is a wasteful number, since it uses less digits than its factorization.

7995138509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10159794.

The product of its (nonzero) digits is 3061800, while the sum is 56.

The square root of 7995138509 is about 89415.5384091602. The cubic root of 7995138509 is about 1999.5947936595.

The spelling of 7995138509 in words is "seven billion, nine hundred ninety-five million, one hundred thirty-eight thousand, five hundred nine".