1305002161 has 8 divisors (see below), whose sum is σ = 1415469384. Its totient is φ = 1198279680.

The previous prime is 1305002119. The next prime is 1305002177. The reversal of 1305002161 is 1612005031.

It can be written as a sum of positive squares in 4 ways, for example, as 30869136 + 1274133025 = 5556^2 + 35695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1305002161 - 2²³ = 1296613553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305002261) 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 7 ways as a sum of consecutive naturals, for example, 935460 + ... + 936853.

It is an arithmetic number, because the mean of its divisors is an integer number (176933673).

Almost surely, 2^1305002161 is an apocalyptic number.

It is an amenable number.

1305002161 is a deficient number, since it is larger than the sum of its proper divisors (110467223).

1305002161 is a wasteful number, since it uses less digits than its factorization.

1305002161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872371.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1305002161 is about 36124.8136465782. The cubic root of 1305002161 is about 1092.7909178530.

Adding to 1305002161 its reverse (1612005031), we get a palindrome (2917007192).

The spelling of 1305002161 in words is "one billion, three hundred five million, two thousand, one hundred sixty-one".