56006521 has 2 divisors, whose sum is σ = 56006522. Its totient is φ = 56006520.

The previous prime is 56006519. The next prime is 56006557. The reversal of 56006521 is 12560065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46172025 + 9834496 = 6795^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 56006521 - 2¹ = 56006519 is a prime.

Together with 56006519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56006021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28003260 + 28003261.

It is an arithmetic number, because the mean of its divisors is an integer number (28003261).

Almost surely, 2^56006521 is an apocalyptic number.

It is an amenable number.

56006521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56006521 is an equidigital number, since it uses as much as digits as its factorization.

56006521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 56006521 is about 7483.7504635042. The cubic root of 56006521 is about 382.6010862451.

Adding to 56006521 its reverse (12560065), we get a palindrome (68566586).

It can be divided in two parts, 5600 and 6521, that added together give a palindrome (12121).

The spelling of 56006521 in words is "fifty-six million, six thousand, five hundred twenty-one".