55172217 has 8 divisors (see below), whose sum is σ = 75551296. Its totient is φ = 35787312.

The previous prime is 55172179. The next prime is 55172231. The reversal of 55172217 is 71227155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-55172217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55172267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248413 + ... + 248634.

It is an arithmetic number, because the mean of its divisors is an integer number (9443912).

Almost surely, 2^55172217 is an apocalyptic number.

It is an amenable number.

55172217 is a deficient number, since it is larger than the sum of its proper divisors (20379079).

55172217 is a wasteful number, since it uses less digits than its factorization.

55172217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497087.

The product of its digits is 4900, while the sum is 30.

The square root of 55172217 is about 7427.8002800291. The cubic root of 55172217 is about 380.6917616344.

The spelling of 55172217 in words is "fifty-five million, one hundred seventy-two thousand, two hundred seventeen".