8081905 has 8 divisors (see below), whose sum is σ = 10444392. Its totient is φ = 5968128.

The previous prime is 8081849. The next prime is 8081929. The reversal of 8081905 is 5091808.

It can be written as a sum of positive squares in 4 ways, for example, as 106929 + 7974976 = 327^2 + 2824^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8081905 - 2¹¹ = 8079857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62104 + ... + 62233.

It is an arithmetic number, because the mean of its divisors is an integer number (1305549).

Almost surely, 2^8081905 is an apocalyptic number.

It is an amenable number.

8081905 is a deficient number, since it is larger than the sum of its proper divisors (2362487).

8081905 is a wasteful number, since it uses less digits than its factorization.

8081905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124355.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 8081905 is about 2842.8691492927. The cubic root of 8081905 is about 200.6802255101.

The spelling of 8081905 in words is "eight million, eighty-one thousand, nine hundred five".