55222191 has 24 divisors (see below), whose sum is σ = 84271616. Its totient is φ = 34791120.

The previous prime is 55222187. The next prime is 55222199. The reversal of 55222191 is 19122255.

55222191 is a `hidden beast` number, since 552 + 2 + 21 + 91 = 666.

It is not a de Polignac number, because 55222191 - 2² = 55222187 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55222199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9696 + ... + 14298.

Almost surely, 2^55222191 is an apocalyptic number.

55222191 is a deficient number, since it is larger than the sum of its proper divisors (29049425).

55222191 is a wasteful number, since it uses less digits than its factorization.

55222191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683 (or 4680 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 55222191 is about 7431.1635024402. The cubic root of 55222191 is about 380.8066681939.

The spelling of 55222191 in words is "fifty-five million, two hundred twenty-two thousand, one hundred ninety-one".