2581554481 has 27 divisors (see below), whose sum is σ = 2951874219. Its totient is φ = 2255919600.

The previous prime is 2581554473. The next prime is 2581554487. The reversal of 2581554481 is 1844551852.

The square root of 2581554481 is 50809.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 302446881 + 2279107600 = 17391^2 + 47740^2 .

It is not a de Polignac number, because 2581554481 - 2³ = 2581554473 is a prime.

It is a super-2 number, since 2×2581554481² = 13328847076742358722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2581554487) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17325795 + ... + 17325943.

Almost surely, 2^2581554481 is an apocalyptic number.

2581554481 is the 50809-th square number.

2581554481 is the 25405-th centered octagonal number.

It is an amenable number.

2581554481 is a deficient number, since it is larger than the sum of its proper divisors (370319738).

2581554481 is an equidigital number, since it uses as much as digits as its factorization.

2581554481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 191 counting only the distinct ones).

The product of its digits is 256000, while the sum is 43.

The cubic root of 2581554481 is about 1371.8093700032.

The spelling of 2581554481 in words is "two billion, five hundred eighty-one million, five hundred fifty-four thousand, four hundred eighty-one".