55192221 has 12 divisors (see below), whose sum is σ = 91111072. Its totient is φ = 31538376.

The previous prime is 55192219. The next prime is 55192223. The reversal of 55192221 is 12229155.

55192221 is a `hidden beast` number, since 551 + 92 + 2 + 21 = 666.

55192221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55192219) and next prime (55192223).

It is not a de Polignac number, because 55192221 - 2¹ = 55192219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55192223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437971 + ... + 438096.

Almost surely, 2^55192221 is an apocalyptic number.

It is an amenable number.

55192221 is a deficient number, since it is larger than the sum of its proper divisors (35918851).

55192221 is a wasteful number, since it uses less digits than its factorization.

55192221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876080 (or 876077 counting only the distinct ones).

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

The square root of 55192221 is about 7429.1467208556. The cubic root of 55192221 is about 380.7377656936.

The spelling of 55192221 in words is "fifty-five million, one hundred ninety-two thousand, two hundred twenty-one".