50555221 has 4 divisors (see below), whose sum is σ = 51630912. Its totient is φ = 49479532.

The previous prime is 50555191. The next prime is 50555231. The reversal of 50555221 is 12255505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12255505 = 5 ⋅2451101.

It is a de Polignac number, because none of the positive numbers 2^k-50555221 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 (50555231) 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, 537775 + ... + 537868.

It is an arithmetic number, because the mean of its divisors is an integer number (12907728).

Almost surely, 2^50555221 is an apocalyptic number.

It is an amenable number.

50555221 is a deficient number, since it is larger than the sum of its proper divisors (1075691).

50555221 is a wasteful number, since it uses less digits than its factorization.

50555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075690.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 50555221 is about 7110.2194762187. The cubic root of 50555221 is about 369.7617677524.

The spelling of 50555221 in words is "fifty million, five hundred fifty-five thousand, two hundred twenty-one".