2581120081 has 4 divisors (see below), whose sum is σ = 2732950692. Its totient is φ = 2429289472.

The previous prime is 2581120049. The next prime is 2581120169. The reversal of 2581120081 is 1800211852.

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 2182758400 + 398361681 = 46720^2 + 19959^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581120081 - 2⁵ = 2581120049 is a prime.

It is a super-2 number, since 2×2581120081² = 13324361745082893122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581120781) 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, 75915280 + ... + 75915313.

It is an arithmetic number, because the mean of its divisors is an integer number (683237673).

Almost surely, 2^2581120081 is an apocalyptic number.

It is an amenable number.

2581120081 is a deficient number, since it is larger than the sum of its proper divisors (151830611).

2581120081 is a wasteful number, since it uses less digits than its factorization.

2581120081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151830610.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 2581120081 is about 50804.7249869537. The cubic root of 2581120081 is about 1371.7324205757.

The spelling of 2581120081 in words is "two billion, five hundred eighty-one million, one hundred twenty thousand, eighty-one".