55222219 has 4 divisors (see below), whose sum is σ = 59470096. Its totient is φ = 50974344.

The previous prime is 55222207. The next prime is 55222229. The reversal of 55222219 is 91222255.

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 55222219 - 2⁵ = 55222187 is a prime.

It is a super-2 number, since 2×55222219² = 6098986942567922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55222229) 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, 2123919 + ... + 2123944.

It is an arithmetic number, because the mean of its divisors is an integer number (14867524).

Almost surely, 2^55222219 is an apocalyptic number.

55222219 is a deficient number, since it is larger than the sum of its proper divisors (4247877).

55222219 is a wasteful number, since it uses less digits than its factorization.

55222219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4247876.

The product of its digits is 3600, while the sum is 28.

The square root of 55222219 is about 7431.1653863980. The cubic root of 55222219 is about 380.8067325557.

The spelling of 55222219 in words is "fifty-five million, two hundred twenty-two thousand, two hundred nineteen".