55205231 has 4 divisors (see below), whose sum is σ = 55225464. Its totient is φ = 55185000.

The previous prime is 55205207. The next prime is 55205243. The reversal of 55205231 is 13250255.

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

It is a cyclic number.

It is not a de Polignac number, because 55205231 - 2⁶ = 55205167 is a prime.

It is a super-2 number, since 2×55205231² = 6095235059526722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55205197 and 55205206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205201) 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, 5240 + ... + 11741.

It is an arithmetic number, because the mean of its divisors is an integer number (13806366).

Almost surely, 2^55205231 is an apocalyptic number.

55205231 is a deficient number, since it is larger than the sum of its proper divisors (20233).

55205231 is a wasteful number, since it uses less digits than its factorization.

55205231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20232.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55205231 is about 7430.0222745292. The cubic root of 55205231 is about 380.7676793848.

Adding to 55205231 its reverse (13250255), we get a palindrome (68455486).

The spelling of 55205231 in words is "fifty-five million, two hundred five thousand, two hundred thirty-one".