55171729 has 4 divisors (see below), whose sum is σ = 55188976. Its totient is φ = 55154484.

The previous prime is 55171679. The next prime is 55171747. The reversal of 55171729 is 92717155.

55171729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55171729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55171789) 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 in 3 ways as a sum of consecutive naturals, for example, 2259 + ... + 10744.

It is an arithmetic number, because the mean of its divisors is an integer number (13797244).

Almost surely, 2^55171729 is an apocalyptic number.

It is an amenable number.

55171729 is a deficient number, since it is larger than the sum of its proper divisors (17247).

55171729 is a wasteful number, since it uses less digits than its factorization.

55171729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17246.

The product of its digits is 22050, while the sum is 37.

The square root of 55171729 is about 7427.7674303925. The cubic root of 55171729 is about 380.6906392209.

The spelling of 55171729 in words is "fifty-five million, one hundred seventy-one thousand, seven hundred twenty-nine".