55045213 has 4 divisors (see below), whose sum is σ = 55151388. Its totient is φ = 54939040.

The previous prime is 55045183. The next prime is 55045231. The reversal of 55045213 is 31254055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6017209 + 49028004 = 2453^2 + 7002^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55045213 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 (55045273) 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, 52306 + ... + 53347.

It is an arithmetic number, because the mean of its divisors is an integer number (13787847).

Almost surely, 2^55045213 is an apocalyptic number.

It is an amenable number.

55045213 is a deficient number, since it is larger than the sum of its proper divisors (106175).

55045213 is a wasteful number, since it uses less digits than its factorization.

55045213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106174.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55045213 is about 7419.2461207322. The cubic root of 55045213 is about 380.3994253462.

Adding to 55045213 its reverse (31254055), we get a palindrome (86299268).

The spelling of 55045213 in words is "fifty-five million, forty-five thousand, two hundred thirteen".