5381681 has 4 divisors (see below), whose sum is σ = 5387364. Its totient is φ = 5376000.

The previous prime is 5381669. The next prime is 5381683. The reversal of 5381681 is 1861835.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1861835 = 5 ⋅372367.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 3841600 = 1241^2 + 1960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5381681 is a prime.

It is a super-2 number, since 2×5381681² = 57924980771522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (5381683) 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, 1040 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (1346841).

Almost surely, 2^5381681 is an apocalyptic number.

It is an amenable number.

5381681 is a deficient number, since it is larger than the sum of its proper divisors (5683).

5381681 is a wasteful number, since it uses less digits than its factorization.

5381681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682.

The product of its digits is 5760, while the sum is 32.

The square root of 5381681 is about 2319.8450379282. The cubic root of 5381681 is about 175.2424503413.

The spelling of 5381681 in words is "five million, three hundred eighty-one thousand, six hundred eighty-one".