55540191 has 16 divisors (see below), whose sum is σ = 87552000. Its totient is φ = 30642528.

The previous prime is 55540171. The next prime is 55540217. The reversal of 55540191 is 19104555.

It is not a de Polignac number, because 55540191 - 2⁵ = 55540159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55540171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44991 + ... + 46208.

It is an arithmetic number, because the mean of its divisors is an integer number (5472000).

Almost surely, 2^55540191 is an apocalyptic number.

55540191 is a deficient number, since it is larger than the sum of its proper divisors (32011809).

55540191 is a wasteful number, since it uses less digits than its factorization.

55540191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91238.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 55540191 is about 7452.5291680073. The cubic root of 55540191 is about 381.5362348900.

The spelling of 55540191 in words is "fifty-five million, five hundred forty thousand, one hundred ninety-one".