55545213 has 4 divisors (see below), whose sum is σ = 74060288. Its totient is φ = 37030140.

The previous prime is 55545209. The next prime is 55545221. The reversal of 55545213 is 31254555.

It is a happy number.

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 not a de Polignac number, because 55545213 - 2² = 55545209 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 (55545223) 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 3 ways as a sum of consecutive naturals, for example, 9257533 + ... + 9257538.

It is an arithmetic number, because the mean of its divisors is an integer number (18515072).

Almost surely, 2^55545213 is an apocalyptic number.

It is an amenable number.

55545213 is a deficient number, since it is larger than the sum of its proper divisors (18515075).

55545213 is a wasteful number, since it uses less digits than its factorization.

55545213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515074.

The product of its digits is 15000, while the sum is 30.

The square root of 55545213 is about 7452.8660929873. The cubic root of 55545213 is about 381.5477341736.

Adding to 55545213 its reverse (31254555), we get a palindrome (86799768).

The spelling of 55545213 in words is "fifty-five million, five hundred forty-five thousand, two hundred thirteen".