55243217 has 12 divisors (see below), whose sum is σ = 61242816. Its totient is φ = 49727040.

The previous prime is 55243213. The next prime is 55243229. The reversal of 55243217 is 71234255.

It is a happy number.

It is not a de Polignac number, because 55243217 - 2² = 55243213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55243217.

It is not an unprimeable number, because it can be changed into a prime (55243211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2492 + ... + 10802.

It is an arithmetic number, because the mean of its divisors is an integer number (5103568).

Almost surely, 2^55243217 is an apocalyptic number.

It is an amenable number.

55243217 is a deficient number, since it is larger than the sum of its proper divisors (5999599).

55243217 is a wasteful number, since it uses less digits than its factorization.

55243217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368 (or 8351 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 55243217 is about 7432.5780856981. The cubic root of 55243217 is about 380.8549931207.

The spelling of 55243217 in words is "fifty-five million, two hundred forty-three thousand, two hundred seventeen".