55130681 has 4 divisors (see below), whose sum is σ = 55145700. Its totient is φ = 55115664.

The previous prime is 55130651. The next prime is 55130689. The reversal of 55130681 is 18603155.

55130681 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 15642025 + 39488656 = 3955^2 + 6284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55130681 is a prime.

It is a super-2 number, since 2×55130681² = 6078783975047522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55130689) 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, 2075 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (13786425).

Almost surely, 2^55130681 is an apocalyptic number.

It is an amenable number.

55130681 is a deficient number, since it is larger than the sum of its proper divisors (15019).

55130681 is an equidigital number, since it uses as much as digits as its factorization.

55130681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15018.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 55130681 is about 7425.0037710428. The cubic root of 55130681 is about 380.5962039811.

The spelling of 55130681 in words is "fifty-five million, one hundred thirty thousand, six hundred eighty-one".