55915729 has 2 divisors, whose sum is σ = 55915730. Its totient is φ = 55915728.

The previous prime is 55915709. The next prime is 55915757. The reversal of 55915729 is 92751955.

It is a happy number.

55915729 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., 55056400 + 859329 = 7420^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 55915729 - 2⁹ = 55915217 is a prime.

It is not a weakly prime, because it can be changed into another prime (55915709) 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, 27957864 + 27957865.

It is an arithmetic number, because the mean of its divisors is an integer number (27957865).

Almost surely, 2^55915729 is an apocalyptic number.

It is an amenable number.

55915729 is a deficient number, since it is larger than the sum of its proper divisors (1).

55915729 is an equidigital number, since it uses as much as digits as its factorization.

55915729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141750, while the sum is 43.

The square root of 55915729 is about 7477.6820606388. The cubic root of 55915729 is about 382.3942299429.

It can be divided in two parts, 55915 and 729, that added together give a square (56644 = 238²).

The spelling of 55915729 in words is "fifty-five million, nine hundred fifteen thousand, seven hundred twenty-nine".