55117171 has 4 divisors (see below), whose sum is σ = 55145952. Its totient is φ = 55088392.

The previous prime is 55117159. The next prime is 55117201. The reversal of 55117171 is 17171155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55117171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55117471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11296 + ... + 15421.

It is an arithmetic number, because the mean of its divisors is an integer number (13786488).

Almost surely, 2^55117171 is an apocalyptic number.

55117171 is a deficient number, since it is larger than the sum of its proper divisors (28781).

55117171 is a wasteful number, since it uses less digits than its factorization.

55117171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28780.

The product of its digits is 1225, while the sum is 28.

The square root of 55117171 is about 7424.0939514529. The cubic root of 55117171 is about 380.5651125532.

The spelling of 55117171 in words is "fifty-five million, one hundred seventeen thousand, one hundred seventy-one".