55171191 has 4 divisors (see below), whose sum is σ = 73561592. Its totient is φ = 36780792.

The previous prime is 55171177. The next prime is 55171211. The reversal of 55171191 is 19117155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55171191 - 2⁵ = 55171159 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 (55171121) 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, 9195196 + ... + 9195201.

It is an arithmetic number, because the mean of its divisors is an integer number (18390398).

Almost surely, 2^55171191 is an apocalyptic number.

55171191 is a deficient number, since it is larger than the sum of its proper divisors (18390401).

55171191 is a wasteful number, since it uses less digits than its factorization.

55171191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390400.

The product of its digits is 1575, while the sum is 30.

The square root of 55171191 is about 7427.7312148462. The cubic root of 55171191 is about 380.6894017983.

The spelling of 55171191 in words is "fifty-five million, one hundred seventy-one thousand, one hundred ninety-one".