55253213 has 4 divisors (see below), whose sum is σ = 58503420. Its totient is φ = 52003008.

The previous prime is 55253147. The next prime is 55253221. The reversal of 55253213 is 31235255.

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 19695844 + 35557369 = 4438^2 + 5963^2 .

It is a cyclic number.

It is not a de Polignac number, because 55253213 - 2¹⁰ = 55252189 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 (55253243) 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, 1625078 + ... + 1625111.

It is an arithmetic number, because the mean of its divisors is an integer number (14625855).

Almost surely, 2^55253213 is an apocalyptic number.

It is an amenable number.

55253213 is a deficient number, since it is larger than the sum of its proper divisors (3250207).

55253213 is a wasteful number, since it uses less digits than its factorization.

55253213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250206.

The product of its digits is 4500, while the sum is 26.

The square root of 55253213 is about 7433.2505002859. The cubic root of 55253213 is about 380.8779630413.

Adding to 55253213 its reverse (31235255), we get a palindrome (86488468).

The spelling of 55253213 in words is "fifty-five million, two hundred fifty-three thousand, two hundred thirteen".