8102581305 has 64 divisors (see below), whose sum is σ = 15971020800. Its totient is φ = 3415862016.

The previous prime is 8102581301. The next prime is 8102581337. The reversal of 8102581305 is 5031852018.

It is a happy number.

It is not a de Polignac number, because 8102581305 - 2² = 8102581301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8102581301) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1907514 + ... + 1911756.

It is an arithmetic number, because the mean of its divisors is an integer number (249547200).

Almost surely, 2^8102581305 is an apocalyptic number.

It is an amenable number.

8102581305 is a deficient number, since it is larger than the sum of its proper divisors (7868439495).

8102581305 is a wasteful number, since it uses less digits than its factorization.

8102581305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 8102581305 is about 90014.3394410024. The cubic root of 8102581305 is about 2008.5121622333.

The spelling of 8102581305 in words is "eight billion, one hundred two million, five hundred eighty-one thousand, three hundred five".