55451213 has 4 divisors (see below), whose sum is σ = 56232288. Its totient is φ = 54670140.

The previous prime is 55451191. The next prime is 55451237. The reversal of 55451213 is 31215455.

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 a de Polignac number, because none of the positive numbers 2^k-55451213 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 (55451273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390431 + ... + 390572.

It is an arithmetic number, because the mean of its divisors is an integer number (14058072).

Almost surely, 2^55451213 is an apocalyptic number.

It is an amenable number.

55451213 is a deficient number, since it is larger than the sum of its proper divisors (781075).

55451213 is an equidigital number, since it uses as much as digits as its factorization.

55451213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781074.

The product of its digits is 3000, while the sum is 26.

The square root of 55451213 is about 7446.5571239332. The cubic root of 55451213 is about 381.3323796542.

Adding to 55451213 its reverse (31215455), we get a palindrome (86666668).

The spelling of 55451213 in words is "fifty-five million, four hundred fifty-one thousand, two hundred thirteen".