55651213 has 2 divisors, whose sum is σ = 55651214. Its totient is φ = 55651212.

The previous prime is 55651199. The next prime is 55651229. The reversal of 55651213 is 31215655.

55651213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28590409 + 27060804 = 5347^2 + 5202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55651213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55651613) 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, 27825606 + 27825607.

It is an arithmetic number, because the mean of its divisors is an integer number (27825607).

Almost surely, 2^55651213 is an apocalyptic number.

It is an amenable number.

55651213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55651213 is an equidigital number, since it uses as much as digits as its factorization.

55651213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 28.

The square root of 55651213 is about 7459.9740616171. The cubic root of 55651213 is about 381.7902894883.

Adding to 55651213 its reverse (31215655), we get a palindrome (86866868).

The spelling of 55651213 in words is "fifty-five million, six hundred fifty-one thousand, two hundred thirteen".