50915721 has 12 divisors (see below), whose sum is σ = 70969808. Its totient is φ = 32466984.

The previous prime is 50915719. The next prime is 50915729. The reversal of 50915721 is 12751905.

It is not a de Polignac number, because 50915721 - 2¹ = 50915719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50915729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14455 + ... + 17628.

Almost surely, 2^50915721 is an apocalyptic number.

It is an amenable number.

50915721 is a deficient number, since it is larger than the sum of its proper divisors (20054087).

50915721 is a wasteful number, since it uses less digits than its factorization.

50915721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32132 (or 32109 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 50915721 is about 7135.5252784921. The cubic root of 50915721 is about 370.6385879902.

The spelling of 50915721 in words is "fifty million, nine hundred fifteen thousand, seven hundred twenty-one".