55380521 has 4 divisors (see below), whose sum is σ = 63292032. Its totient is φ = 47469012.

The previous prime is 55380511. The next prime is 55380529. The reversal of 55380521 is 12508355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55380521 - 2¹⁰ = 55379497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55380529) 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, 3955745 + ... + 3955758.

It is an arithmetic number, because the mean of its divisors is an integer number (15823008).

Almost surely, 2^55380521 is an apocalyptic number.

It is an amenable number.

55380521 is a deficient number, since it is larger than the sum of its proper divisors (7911511).

55380521 is an equidigital number, since it uses as much as digits as its factorization.

55380521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7911510.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 55380521 is about 7441.8089870676. The cubic root of 55380521 is about 381.1702635003.

Adding to 55380521 its reverse (12508355), we get a palindrome (67888876).

The spelling of 55380521 in words is "fifty-five million, three hundred eighty thousand, five hundred twenty-one".