55591147 has 4 divisors (see below), whose sum is σ = 55621840. Its totient is φ = 55560456.

The previous prime is 55591097. The next prime is 55591171. The reversal of 55591147 is 74119555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74119555 = 5 ⋅14823911.

It is a cyclic number.

It is not a de Polignac number, because 55591147 - 2¹⁵ = 55558379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55591847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12447 + ... + 16312.

It is an arithmetic number, because the mean of its divisors is an integer number (13905460).

Almost surely, 2^55591147 is an apocalyptic number.

55591147 is a deficient number, since it is larger than the sum of its proper divisors (30693).

55591147 is a wasteful number, since it uses less digits than its factorization.

55591147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30692.

The product of its digits is 31500, while the sum is 37.

The square root of 55591147 is about 7455.9470894045. The cubic root of 55591147 is about 381.6528808566.

The spelling of 55591147 in words is "fifty-five million, five hundred ninety-one thousand, one hundred forty-seven".