55136813 has 2 divisors, whose sum is σ = 55136814. Its totient is φ = 55136812.

The previous prime is 55136789. The next prime is 55136843. The reversal of 55136813 is 31863155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33028009 + 22108804 = 5747^2 + 4702^2 .

It is a cyclic number.

It is not a de Polignac number, because 55136813 - 2¹⁶ = 55071277 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55136813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55136843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568406 + 27568407.

It is an arithmetic number, because the mean of its divisors is an integer number (27568407).

Almost surely, 2^55136813 is an apocalyptic number.

It is an amenable number.

55136813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136813 is an equidigital number, since it uses as much as digits as its factorization.

55136813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 55136813 is about 7425.4166886445. The cubic root of 55136813 is about 380.6103142693.

Adding to 55136813 its reverse (31863155), we get a palindrome (86999968).

The spelling of 55136813 in words is "fifty-five million, one hundred thirty-six thousand, eight hundred thirteen".