5128681 has 8 divisors (see below), whose sum is σ = 5325320. Its totient is φ = 4935168.

The previous prime is 5128667. The next prime is 5128691. The reversal of 5128681 is 1868215.

It can be written as a sum of positive squares in 4 ways, for example, as 549081 + 4579600 = 741^2 + 2140^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5128681 - 2⁷ = 5128553 is a prime.

It is a super-2 number, since 2×5128681² = 52606737599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5128661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875 + ... + 4303.

It is an arithmetic number, because the mean of its divisors is an integer number (665665).

Almost surely, 2^5128681 is an apocalyptic number.

It is an amenable number.

5128681 is a deficient number, since it is larger than the sum of its proper divisors (196639).

5128681 is a wasteful number, since it uses less digits than its factorization.

5128681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563.

The product of its digits is 3840, while the sum is 31.

The square root of 5128681 is about 2264.6591354992. The cubic root of 5128681 is about 172.4521298240.

The spelling of 5128681 in words is "five million, one hundred twenty-eight thousand, six hundred eighty-one".