5681537 has 4 divisors (see below), whose sum is σ = 5686320. Its totient is φ = 5676756.

The previous prime is 5681531. The next prime is 5681561. The reversal of 5681537 is 7351865.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7351865 = 5 ⋅1470373.

It is a cyclic number.

It is not a de Polignac number, because 5681537 - 2⁴ = 5681521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5681497 and 5681506.

It is not an unprimeable number, because it can be changed into a prime (5681531) 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, 914 + ... + 3492.

It is an arithmetic number, because the mean of its divisors is an integer number (1421580).

Almost surely, 2^5681537 is an apocalyptic number.

It is an amenable number.

5681537 is a deficient number, since it is larger than the sum of its proper divisors (4783).

5681537 is a wasteful number, since it uses less digits than its factorization.

5681537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782.

The product of its digits is 25200, while the sum is 35.

The square root of 5681537 is about 2383.5974911885. The cubic root of 5681537 is about 178.4385202570.

The spelling of 5681537 in words is "five million, six hundred eighty-one thousand, five hundred thirty-seven".