55306261 has 4 divisors (see below), whose sum is σ = 55321452. Its totient is φ = 55291072.

The previous prime is 55306249. The next prime is 55306271. The reversal of 55306261 is 16260355.

55306261 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1943236 + 53363025 = 1394^2 + 7305^2 .

It is a cyclic number.

It is not a de Polignac number, because 55306261 - 2⁷ = 55306133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55306211) 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, 1485 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (13830363).

Almost surely, 2^55306261 is an apocalyptic number.

It is an amenable number.

55306261 is a deficient number, since it is larger than the sum of its proper divisors (15191).

55306261 is an equidigital number, since it uses as much as digits as its factorization.

55306261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15190.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55306261 is about 7436.8179351118. The cubic root of 55306261 is about 380.9998162958. Note that the first 3 decimals are identical.

The spelling of 55306261 in words is "fifty-five million, three hundred six thousand, two hundred sixty-one".