55144813 has 2 divisors, whose sum is σ = 55144814. Its totient is φ = 55144812.

The previous prime is 55144807. The next prime is 55144841. The reversal of 55144813 is 31844155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31505769 + 23639044 = 5613^2 + 4862^2 .

It is a cyclic number.

It is not a de Polignac number, because 55144813 - 2⁵ = 55144781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55144013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27572406 + 27572407.

It is an arithmetic number, because the mean of its divisors is an integer number (27572407).

Almost surely, 2^55144813 is an apocalyptic number.

It is an amenable number.

55144813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55144813 is an equidigital number, since it uses as much as digits as its factorization.

55144813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

The square root of 55144813 is about 7425.9553594134. The cubic root of 55144813 is about 380.6287214223.

Adding to 55144813 its reverse (31844155), we get a palindrome (86988968).

The spelling of 55144813 in words is "fifty-five million, one hundred forty-four thousand, eight hundred thirteen".