4009081 has 4 divisors (see below), whose sum is σ = 4013200. Its totient is φ = 4004964.

The previous prime is 4009051. The next prime is 4009091. The reversal of 4009081 is 1809004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4009081 - 2¹¹ = 4007033 is a prime.

It is a super-2 number, since 2×4009081² = 32145460929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4009001) 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 3 ways as a sum of consecutive naturals, for example, 310 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (1003300).

Almost surely, 2^4009081 is an apocalyptic number.

It is an amenable number.

4009081 is a deficient number, since it is larger than the sum of its proper divisors (4119).

4009081 is a wasteful number, since it uses less digits than its factorization.

4009081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 4009081 is about 2002.2689629518. The cubic root of 4009081 is about 158.8601409801.

The spelling of 4009081 in words is "four million, nine thousand, eighty-one".