2439808081 has 4 divisors (see below), whose sum is σ = 2442033252. Its totient is φ = 2437582912.

The previous prime is 2439808073. The next prime is 2439808087. The reversal of 2439808081 is 1808089342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 989417025 + 1450391056 = 31455^2 + 38084^2 .

It is a cyclic number.

It is not a de Polignac number, because 2439808081 - 2³ = 2439808073 is a prime.

It is a super-2 number, since 2×2439808081² = 11905326944225805122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2439808087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110940 + ... + 1113133.

It is an arithmetic number, because the mean of its divisors is an integer number (610508313).

Almost surely, 2^2439808081 is an apocalyptic number.

It is an amenable number.

2439808081 is a deficient number, since it is larger than the sum of its proper divisors (2225171).

2439808081 is a wasteful number, since it uses less digits than its factorization.

2439808081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225170.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 2439808081 is about 49394.4134594187. The cubic root of 2439808081 is about 1346.2278016058.

The spelling of 2439808081 in words is "two billion, four hundred thirty-nine million, eight hundred eight thousand, eighty-one".