55365121 has 4 divisors (see below), whose sum is σ = 63274432. Its totient is φ = 47455812.

The previous prime is 55365119. The next prime is 55365131. The reversal of 55365121 is 12156355.

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 55365121 - 2¹ = 55365119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55365121.

It is not an unprimeable number, because it can be changed into a prime (55365131) 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, 3954645 + ... + 3954658.

It is an arithmetic number, because the mean of its divisors is an integer number (15818608).

Almost surely, 2^55365121 is an apocalyptic number.

It is an amenable number.

55365121 is a deficient number, since it is larger than the sum of its proper divisors (7909311).

55365121 is an equidigital number, since it uses as much as digits as its factorization.

55365121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909310.

The product of its digits is 4500, while the sum is 28.

The square root of 55365121 is about 7440.7742204693. The cubic root of 55365121 is about 381.1349287764.

The spelling of 55365121 in words is "fifty-five million, three hundred sixty-five thousand, one hundred twenty-one".