55006213 has 2 divisors, whose sum is σ = 55006214. Its totient is φ = 55006212.

The previous prime is 55006177. The next prime is 55006219. The reversal of 55006213 is 31260055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42601729 + 12404484 = 6527^2 + 3522^2 .

It is a cyclic number.

It is not a de Polignac number, because 55006213 - 2⁹ = 55005701 is a prime.

It is a super-3 number, since 3×55006213³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55006219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27503106 + 27503107.

It is an arithmetic number, because the mean of its divisors is an integer number (27503107).

Almost surely, 2^55006213 is an apocalyptic number.

It is an amenable number.

55006213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55006213 is an equidigital number, since it uses as much as digits as its factorization.

55006213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 55006213 is about 7416.6173556413. The cubic root of 55006213 is about 380.3095653816.

Adding to 55006213 its reverse (31260055), we get a palindrome (86266268).

The spelling of 55006213 in words is "fifty-five million, six thousand, two hundred thirteen".