55977613 has 2 divisors, whose sum is σ = 55977614. Its totient is φ = 55977612.

The previous prime is 55977563. The next prime is 55977619. The reversal of 55977613 is 31677955.

55977613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37124649 + 18852964 = 6093^2 + 4342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55977613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55977613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55977619) 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 as a sum of consecutive naturals, namely, 27988806 + 27988807.

It is an arithmetic number, because the mean of its divisors is an integer number (27988807).

Almost surely, 2^55977613 is an apocalyptic number.

It is an amenable number.

55977613 is a deficient number, since it is larger than the sum of its proper divisors (1).

55977613 is an equidigital number, since it uses as much as digits as its factorization.

55977613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198450, while the sum is 43.

The square root of 55977613 is about 7481.8188296697. The cubic root of 55977613 is about 382.5352478660.

The spelling of 55977613 in words is "fifty-five million, nine hundred seventy-seven thousand, six hundred thirteen".