7981165 has 4 divisors (see below), whose sum is σ = 9577404. Its totient is φ = 6384928.

The previous prime is 7981151. The next prime is 7981189. The reversal of 7981165 is 5611897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5611897 = 19 ⋅295363.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 6959044 = 1011^2 + 2638^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981165 - 2⁷ = 7981037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 798112 + ... + 798121.

It is an arithmetic number, because the mean of its divisors is an integer number (2394351).

Almost surely, 2^7981165 is an apocalyptic number.

It is an amenable number.

7981165 is a deficient number, since it is larger than the sum of its proper divisors (1596239).

7981165 is a wasteful number, since it uses less digits than its factorization.

7981165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596238.

The product of its digits is 15120, while the sum is 37.

The square root of 7981165 is about 2825.0955736045. The cubic root of 7981165 is about 199.8429183257.

The spelling of 7981165 in words is "seven million, nine hundred eighty-one thousand, one hundred sixty-five".