55229215 has 4 divisors (see below), whose sum is σ = 66275064. Its totient is φ = 44183368.

The previous prime is 55229203. The next prime is 55229231. The reversal of 55229215 is 51292255.

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

It is a cyclic number.

It is not a de Polignac number, because 55229215 - 2⁷ = 55229087 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5522917 + ... + 5522926.

It is an arithmetic number, because the mean of its divisors is an integer number (16568766).

Almost surely, 2^55229215 is an apocalyptic number.

55229215 is a deficient number, since it is larger than the sum of its proper divisors (11045849).

55229215 is a wasteful number, since it uses less digits than its factorization.

55229215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11045848.

The product of its digits is 9000, while the sum is 31.

The square root of 55229215 is about 7431.6360917365. The cubic root of 55229215 is about 380.8228131083.

The spelling of 55229215 in words is "fifty-five million, two hundred twenty-nine thousand, two hundred fifteen".