8081613 has 20 divisors (see below), whose sum is σ = 12784860. Its totient is φ = 5069952.

The previous prime is 8081581. The next prime is 8081629. The reversal of 8081613 is 3161808.

It can be written as a sum of positive squares in 2 ways, for example, as 3337929 + 4743684 = 1827^2 + 2178^2 .

It is not a de Polignac number, because 8081613 - 2⁵ = 8081581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

8081613 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8081653) 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 in 19 ways as a sum of consecutive naturals, for example, 1558 + ... + 4311.

It is an arithmetic number, because the mean of its divisors is an integer number (639243).

Almost surely, 2^8081613 is an apocalyptic number.

It is an amenable number.

8081613 is a deficient number, since it is larger than the sum of its proper divisors (4703247).

8081613 is a wasteful number, since it uses less digits than its factorization.

8081613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5898 (or 5889 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 8081613 is about 2842.8177922618. The cubic root of 8081613 is about 200.6778086157.

The spelling of 8081613 in words is "eight million, eighty-one thousand, six hundred thirteen".