56110721 has 2 divisors, whose sum is σ = 56110722. Its totient is φ = 56110720.

The previous prime is 56110709. The next prime is 56110751. The reversal of 56110721 is 12701165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56085121 + 25600 = 7489^2 + 160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56110721 is a prime.

It is a super-2 number, since 2×56110721² = 6296826022279682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56110751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28055360 + 28055361.

It is an arithmetic number, because the mean of its divisors is an integer number (28055361).

Almost surely, 2^56110721 is an apocalyptic number.

It is an amenable number.

56110721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56110721 is an equidigital number, since it uses as much as digits as its factorization.

56110721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 56110721 is about 7490.7089784613. The cubic root of 56110721 is about 382.8382153854.

Adding to 56110721 its reverse (12701165), we get a palindrome (68811886).

The spelling of 56110721 in words is "fifty-six million, one hundred ten thousand, seven hundred twenty-one".