55205242 has 4 divisors (see below), whose sum is σ = 82807866. Its totient is φ = 27602620.

The previous prime is 55205207. The next prime is 55205243. The reversal of 55205242 is 24250255.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24250255 = 5 ⋅4850051.

It can be written as a sum of positive squares in only one way, i.e., 53743561 + 1461681 = 7331^2 + 1209^2 .

It is not an unprimeable number, because it can be changed into a prime (55205243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13801309 + ... + 13801312.

Almost surely, 2^55205242 is an apocalyptic number.

55205242 is a deficient number, since it is larger than the sum of its proper divisors (27602624).

55205242 is a wasteful number, since it uses less digits than its factorization.

55205242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27602623.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 55205242 is about 7430.0230147692. The cubic root of 55205242 is about 380.7677046750.

Adding to 55205242 its reverse (24250255), we get a palindrome (79455497).

The spelling of 55205242 in words is "fifty-five million, two hundred five thousand, two hundred forty-two".