55353213 has 36 divisors (see below), whose sum is σ = 87648288. Its totient is φ = 34904520.

The previous prime is 55353209. The next prime is 55353223. The reversal of 55353213 is 31235355.

It is not a de Polignac number, because 55353213 - 2² = 55353209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55353223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87408 + ... + 88038.

Almost surely, 2^55353213 is an apocalyptic number.

It is an amenable number.

55353213 is a deficient number, since it is larger than the sum of its proper divisors (32295075).

55353213 is an equidigital number, since it uses as much as digits as its factorization.

55353213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 653 counting only the distinct ones).

The product of its digits is 6750, while the sum is 27.

The square root of 55353213 is about 7439.9739918900. The cubic root of 55353213 is about 381.1076018236.

Adding to 55353213 its reverse (31235355), we get a palindrome (86588568).

The spelling of 55353213 in words is "fifty-five million, three hundred fifty-three thousand, two hundred thirteen".