5681671521 has 8 divisors (see below), whose sum is σ = 7575922560. Its totient is φ = 3787600752.

The previous prime is 5681671519. The next prime is 5681671549. The reversal of 5681671521 is 1251761865.

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

It is not a de Polignac number, because 5681671521 - 2¹ = 5681671519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5681671511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71691 + ... + 128463.

It is an arithmetic number, because the mean of its divisors is an integer number (946990320).

Almost surely, 2^5681671521 is an apocalyptic number.

It is an amenable number.

5681671521 is a deficient number, since it is larger than the sum of its proper divisors (1894251039).

5681671521 is a wasteful number, since it uses less digits than its factorization.

5681671521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90135.

The product of its digits is 100800, while the sum is 42.

The square root of 5681671521 is about 75376.8633003523. The cubic root of 5681671521 is about 1784.3992853425.

The spelling of 5681671521 in words is "five billion, six hundred eighty-one million, six hundred seventy-one thousand, five hundred twenty-one".