56105531 has 2 divisors, whose sum is σ = 56105532. Its totient is φ = 56105530.

The previous prime is 56105521. The next prime is 56105551. The reversal of 56105531 is 13550165.

56105531 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 is a cyclic number.

It is not a de Polignac number, because 56105531 - 2¹⁴ = 56089147 is a prime.

It is a super-2 number, since 2×56105531² = 6295661217583922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56105531.

It is not a weakly prime, because it can be changed into another prime (56105501) 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, 28052765 + 28052766.

It is an arithmetic number, because the mean of its divisors is an integer number (28052766).

Almost surely, 2^56105531 is an apocalyptic number.

56105531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56105531 is an equidigital number, since it uses as much as digits as its factorization.

56105531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 56105531 is about 7490.3625412926. The cubic root of 56105531 is about 382.8264113928.

Adding to 56105531 its reverse (13550165), we get a palindrome (69655696).

The spelling of 56105531 in words is "fifty-six million, one hundred five thousand, five hundred thirty-one".