5681731 has 4 divisors (see below), whose sum is σ = 6198264. Its totient is φ = 5165200.

The previous prime is 5681729. The next prime is 5681737. The reversal of 5681731 is 1371865.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5681731 - 2¹ = 5681729 is a prime.

It is a super-2 number, since 2×5681731² = 64564134312722, which contains 22 as substring.

It is a Duffinian number.

5681731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5681693 and 5681702.

It is not an unprimeable number, because it can be changed into a prime (5681737) 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 3 ways as a sum of consecutive naturals, for example, 258250 + ... + 258271.

It is an arithmetic number, because the mean of its divisors is an integer number (1549566).

Almost surely, 2^5681731 is an apocalyptic number.

5681731 is a deficient number, since it is larger than the sum of its proper divisors (516533).

5681731 is a wasteful number, since it uses less digits than its factorization.

5681731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516532.

The product of its digits is 5040, while the sum is 31.

The square root of 5681731 is about 2383.6381856314. The cubic root of 5681731 is about 178.4405512026.

The spelling of 5681731 in words is "five million, six hundred eighty-one thousand, seven hundred thirty-one".