55312223 has 4 divisors (see below), whose sum is σ = 55327800. Its totient is φ = 55296648.

The previous prime is 55312189. The next prime is 55312267. The reversal of 55312223 is 32221355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32221355 = 5 ⋅6444271.

It is a cyclic number.

It is not a de Polignac number, because 55312223 - 2¹⁰ = 55311199 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 (55312273) 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, 428 + ... + 10526.

It is an arithmetic number, because the mean of its divisors is an integer number (13831950).

Almost surely, 2^55312223 is an apocalyptic number.

55312223 is a deficient number, since it is larger than the sum of its proper divisors (15577).

55312223 is a wasteful number, since it uses less digits than its factorization.

55312223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15576.

The product of its digits is 1800, while the sum is 23.

The square root of 55312223 is about 7437.2187677922. The cubic root of 55312223 is about 381.0135063630.

Adding to 55312223 its reverse (32221355), we get a palindrome (87533578).

The spelling of 55312223 in words is "fifty-five million, three hundred twelve thousand, two hundred twenty-three".