55229521 has 4 divisors (see below), whose sum is σ = 55319652. Its totient is φ = 55139392.

The previous prime is 55229519. The next prime is 55229579. The reversal of 55229521 is 12592255.

55229521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8785296 + 46444225 = 2964^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 55229521 - 2¹ = 55229519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55220521) 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 3 ways as a sum of consecutive naturals, for example, 44140 + ... + 45373.

It is an arithmetic number, because the mean of its divisors is an integer number (13829913).

Almost surely, 2^55229521 is an apocalyptic number.

It is an amenable number.

55229521 is a deficient number, since it is larger than the sum of its proper divisors (90131).

55229521 is an equidigital number, since it uses as much as digits as its factorization.

55229521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90130.

The product of its digits is 9000, while the sum is 31.

The square root of 55229521 is about 7431.6566793683. The cubic root of 55229521 is about 380.8235164291.

The spelling of 55229521 in words is "fifty-five million, two hundred twenty-nine thousand, five hundred twenty-one".