56511001 has 2 divisors, whose sum is σ = 56511002. Its totient is φ = 56511000.

The previous prime is 56510999. The next prime is 56511029. The reversal of 56511001 is 10011565.

56511001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 18071001 = 6200^2 + 4251^2 .

It is a cyclic number.

It is not a de Polignac number, because 56511001 - 2¹ = 56510999 is a prime.

Together with 56510999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56511001.

It is not a weakly prime, because it can be changed into another prime (56518001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28255500 + 28255501.

It is an arithmetic number, because the mean of its divisors is an integer number (28255501).

Almost surely, 2^56511001 is an apocalyptic number.

It is an amenable number.

56511001 is a deficient number, since it is larger than the sum of its proper divisors (1).

56511001 is an equidigital number, since it uses as much as digits as its factorization.

56511001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 56511001 is about 7517.3799292041. The cubic root of 56511001 is about 383.7464168693.

Adding to 56511001 its reverse (10011565), we get a palindrome (66522566).

The spelling of 56511001 in words is "fifty-six million, five hundred eleven thousand, one".