5156681 has 4 divisors (see below), whose sum is σ = 5204100. Its totient is φ = 5109264.

The previous prime is 5156663. The next prime is 5156719. The reversal of 5156681 is 1866515.

It is a happy number.

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 1974025 + 3182656 = 1405^2 + 1784^2 .

It is a cyclic number.

It is not a de Polignac number, because 5156681 - 2¹⁴ = 5140297 is a prime.

It is a super-2 number, since 2×5156681² = 53182717871522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5152681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23546 + ... + 23763.

It is an arithmetic number, because the mean of its divisors is an integer number (1301025).

Almost surely, 2^5156681 is an apocalyptic number.

It is an amenable number.

5156681 is a deficient number, since it is larger than the sum of its proper divisors (47419).

5156681 is a wasteful number, since it uses less digits than its factorization.

5156681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47418.

The product of its digits is 7200, while the sum is 32.

The square root of 5156681 is about 2270.8326666666. The cubic root of 5156681 is about 172.7653941797.

The spelling of 5156681 in words is "five million, one hundred fifty-six thousand, six hundred eighty-one".