50017721 has 16 divisors (see below), whose sum is σ = 56106960. Its totient is φ = 44271360.

The previous prime is 50017717. The next prime is 50017753. The reversal of 50017721 is 12771005.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2062096 + 47955625 = 1436^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 50017721 - 2² = 50017717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50013721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67871 + ... + 68603.

It is an arithmetic number, because the mean of its divisors is an integer number (3506685).

Almost surely, 2^50017721 is an apocalyptic number.

It is an amenable number.

50017721 is a deficient number, since it is larger than the sum of its proper divisors (6089239).

50017721 is a wasteful number, since it uses less digits than its factorization.

50017721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 50017721 is about 7072.3207647844. The cubic root of 50017721 is about 368.4466678714.

Adding to 50017721 its reverse (12771005), we get a palindrome (62788726).

The spelling of 50017721 in words is "fifty million, seventeen thousand, seven hundred twenty-one".