2555447581 has 4 divisors (see below), whose sum is σ = 2558130012. Its totient is φ = 2552765152.

The previous prime is 2555447569. The next prime is 2555447593. The reversal of 2555447581 is 1857445552.

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

It is an interprime number because it is at equal distance from previous prime (2555447569) and next prime (2555447593).

It can be written as a sum of positive squares in 2 ways, for example, as 1915812900 + 639634681 = 43770^2 + 25291^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555447581 - 2¹¹ = 2555445533 is a prime.

It is a super-2 number, since 2×2555447581² = 13060624678477503122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555447501) 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, 1339786 + ... + 1341691.

It is an arithmetic number, because the mean of its divisors is an integer number (639532503).

Almost surely, 2^2555447581 is an apocalyptic number.

It is an amenable number.

2555447581 is a deficient number, since it is larger than the sum of its proper divisors (2682431).

2555447581 is an equidigital number, since it uses as much as digits as its factorization.

2555447581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682430.

The product of its digits is 1120000, while the sum is 46.

The square root of 2555447581 is about 50551.4350043597. The cubic root of 2555447581 is about 1367.1693879734.

The spelling of 2555447581 in words is "two billion, five hundred fifty-five million, four hundred forty-seven thousand, five hundred eighty-one".