55521147 has 16 divisors (see below), whose sum is σ = 82478592. Its totient is φ = 32932320.

The previous prime is 55521143. The next prime is 55521161. The reversal of 55521147 is 74112555.

It is not a de Polignac number, because 55521147 - 2² = 55521143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55521143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16348 + ... + 19449.

It is an arithmetic number, because the mean of its divisors is an integer number (5154912).

Almost surely, 2^55521147 is an apocalyptic number.

55521147 is a deficient number, since it is larger than the sum of its proper divisors (26957445).

55521147 is a wasteful number, since it uses less digits than its factorization.

55521147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35858.

The product of its digits is 7000, while the sum is 30.

The square root of 55521147 is about 7451.2513714141. The cubic root of 55521147 is about 381.4926219882.

The spelling of 55521147 in words is "fifty-five million, five hundred twenty-one thousand, one hundred forty-seven".