5781281 has 4 divisors (see below), whose sum is σ = 6306864. Its totient is φ = 5255700.

The previous prime is 5781277. The next prime is 5781289. The reversal of 5781281 is 1821875.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5781281 - 2² = 5781277 is a prime.

It is a super-2 number, since 2×5781281² = 66846420001922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5781289) 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, 262775 + ... + 262796.

It is an arithmetic number, because the mean of its divisors is an integer number (1576716).

Almost surely, 2^5781281 is an apocalyptic number.

It is an amenable number.

5781281 is a deficient number, since it is larger than the sum of its proper divisors (525583).

5781281 is a wasteful number, since it uses less digits than its factorization.

5781281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525582.

The product of its digits is 4480, while the sum is 32.

The square root of 5781281 is about 2404.4294541533. The cubic root of 5781281 is about 179.4766795949.

The spelling of 5781281 in words is "five million, seven hundred eighty-one thousand, two hundred eighty-one".