55330191 has 24 divisors (see below), whose sum is σ = 91638144. Its totient is φ = 31513680.

The previous prime is 55330183. The next prime is 55330199. The reversal of 55330191 is 19103355.

55330191 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 (55330183) and next prime (55330199).

It is not a de Polignac number, because 55330191 - 2³ = 55330183 is a prime.

It is a super-2 number, since 2×55330191² = 6122860072192962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55330199) 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 23 ways as a sum of consecutive naturals, for example, 20596 + ... + 23126.

It is an arithmetic number, because the mean of its divisors is an integer number (3818256).

Almost surely, 2^55330191 is an apocalyptic number.

55330191 is a deficient number, since it is larger than the sum of its proper divisors (36307953).

55330191 is a wasteful number, since it uses less digits than its factorization.

55330191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891 (or 2888 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The square root of 55330191 is about 7438.4266481562. The cubic root of 55330191 is about 381.0547589056.

The spelling of 55330191 in words is "fifty-five million, three hundred thirty thousand, one hundred ninety-one".