55172215 has 16 divisors (see below), whose sum is σ = 75801600. Its totient is φ = 37764000.

The previous prime is 55172179. The next prime is 55172231. The reversal of 55172215 is 51227155.

It is not a de Polignac number, because 55172215 - 2⁷ = 55172087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25236 + ... + 27334.

It is an arithmetic number, because the mean of its divisors is an integer number (4737600).

Almost surely, 2^55172215 is an apocalyptic number.

55172215 is a deficient number, since it is larger than the sum of its proper divisors (20629385).

55172215 is a wasteful number, since it uses less digits than its factorization.

55172215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its digits is 3500, while the sum is 28.

The square root of 55172215 is about 7427.8001453997. The cubic root of 55172215 is about 380.6917570344.

The spelling of 55172215 in words is "fifty-five million, one hundred seventy-two thousand, two hundred fifteen".