2558961281 has 4 divisors (see below), whose sum is σ = 2582438100. Its totient is φ = 2535484464.

The previous prime is 2558961277. The next prime is 2558961319. The reversal of 2558961281 is 1821698552.

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 723610000 + 1835351281 = 26900^2 + 42841^2 .

It is a cyclic number.

It is not a de Polignac number, because 2558961281 - 2² = 2558961277 is a prime.

It is a super-2 number, since 2×2558961281² = 13096565675314321922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2558961241) 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, 11738246 + ... + 11738463.

It is an arithmetic number, because the mean of its divisors is an integer number (645609525).

Almost surely, 2^2558961281 is an apocalyptic number.

It is an amenable number.

2558961281 is a deficient number, since it is larger than the sum of its proper divisors (23476819).

2558961281 is a wasteful number, since it uses less digits than its factorization.

2558961281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23476818.

The product of its digits is 345600, while the sum is 47.

The square root of 2558961281 is about 50586.1767778511. The cubic root of 2558961281 is about 1367.7957130926.

The spelling of 2558961281 in words is "two billion, five hundred fifty-eight million, nine hundred sixty-one thousand, two hundred eighty-one".