55133213 has 4 divisors (see below), whose sum is σ = 55463520. Its totient is φ = 54802908.

The previous prime is 55133201. The next prime is 55133251. The reversal of 55133213 is 31233155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55133213 - 2¹⁴ = 55116829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55133413) 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 in 3 ways as a sum of consecutive naturals, for example, 164903 + ... + 165236.

It is an arithmetic number, because the mean of its divisors is an integer number (13865880).

Almost surely, 2^55133213 is an apocalyptic number.

It is an amenable number.

55133213 is a deficient number, since it is larger than the sum of its proper divisors (330307).

55133213 is a wasteful number, since it uses less digits than its factorization.

55133213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330306.

The product of its digits is 1350, while the sum is 23.

The square root of 55133213 is about 7425.1742740491. The cubic root of 55133213 is about 380.6020304696.

Adding to 55133213 its reverse (31233155), we get a palindrome (86366368).

The spelling of 55133213 in words is "fifty-five million, one hundred thirty-three thousand, two hundred thirteen".