55812521 has 8 divisors (see below), whose sum is σ = 57353184. Its totient is φ = 54280480.

The previous prime is 55812509. The next prime is 55812527. The reversal of 55812521 is 12521855.

55812521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55812521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55812527) 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 7 ways as a sum of consecutive naturals, for example, 12266 + ... + 16188.

It is an arithmetic number, because the mean of its divisors is an integer number (7169148).

Almost surely, 2^55812521 is an apocalyptic number.

It is an amenable number.

55812521 is a deficient number, since it is larger than the sum of its proper divisors (1540663).

55812521 is a wasteful number, since it uses less digits than its factorization.

55812521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311.

The product of its digits is 4000, while the sum is 29.

The square root of 55812521 is about 7470.7778042182. Note that the first 3 decimals coincide. The cubic root of 55812521 is about 382.1588134735.

The spelling of 55812521 in words is "fifty-five million, eight hundred twelve thousand, five hundred twenty-one".