7991065 has 4 divisors (see below), whose sum is σ = 9589284. Its totient is φ = 6392848.

The previous prime is 7991059. The next prime is 7991083. The reversal of 7991065 is 5601997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5601997 = 43 ⋅130279.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 6901129 = 1044^2 + 2627^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991065 - 2³ = 7991057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799102 + ... + 799111.

It is an arithmetic number, because the mean of its divisors is an integer number (2397321).

Almost surely, 2^7991065 is an apocalyptic number.

It is an amenable number.

7991065 is a deficient number, since it is larger than the sum of its proper divisors (1598219).

7991065 is a wasteful number, since it uses less digits than its factorization.

7991065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598218.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 7991065 is about 2826.8471837013. The cubic root of 7991065 is about 199.9255139292.

The spelling of 7991065 in words is "seven million, nine hundred ninety-one thousand, sixty-five".