2582561281 has 4 divisors (see below), whose sum is σ = 2582901972. Its totient is φ = 2582220592.

The previous prime is 2582561269. The next prime is 2582561287. The reversal of 2582561281 is 1821652852.

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 2458573056 + 123988225 = 49584^2 + 11135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2582561281 - 2⁵ = 2582561249 is a prime.

It is a super-2 number, since 2×2582561281² = 13339245540240721922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2582561287) 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, 158710 + ... + 174223.

It is an arithmetic number, because the mean of its divisors is an integer number (645725493).

Almost surely, 2^2582561281 is an apocalyptic number.

It is an amenable number.

2582561281 is a deficient number, since it is larger than the sum of its proper divisors (340691).

2582561281 is an equidigital number, since it uses as much as digits as its factorization.

2582561281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340690.

The product of its digits is 76800, while the sum is 40.

The square root of 2582561281 is about 50818.9067277131. The cubic root of 2582561281 is about 1371.9876809364.

The spelling of 2582561281 in words is "two billion, five hundred eighty-two million, five hundred sixty-one thousand, two hundred eighty-one".