56521671 has 4 divisors (see below), whose sum is σ = 75362232. Its totient is φ = 37681112.

The previous prime is 56521631. The next prime is 56521687. The reversal of 56521671 is 17612565.

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 56521671 - 2¹⁰ = 56520647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56521601) 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 3 ways as a sum of consecutive naturals, for example, 9420276 + ... + 9420281.

It is an arithmetic number, because the mean of its divisors is an integer number (18840558).

Almost surely, 2^56521671 is an apocalyptic number.

56521671 is a deficient number, since it is larger than the sum of its proper divisors (18840561).

56521671 is a wasteful number, since it uses less digits than its factorization.

56521671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18840560.

The product of its digits is 12600, while the sum is 33.

The square root of 56521671 is about 7518.0895844623. The cubic root of 56521671 is about 383.7705674271.

The spelling of 56521671 in words is "fifty-six million, five hundred twenty-one thousand, six hundred seventy-one".