50721505 has 4 divisors (see below), whose sum is σ = 60865812. Its totient is φ = 40577200.

The previous prime is 50721491. The next prime is 50721547. The reversal of 50721505 is 50512705.

It is a happy number.

50721505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15864289 + 34857216 = 3983^2 + 5904^2 .

It is not a de Polignac number, because 50721505 - 2⁹ = 50720993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 50721505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5072146 + ... + 5072155.

It is an arithmetic number, because the mean of its divisors is an integer number (15216453).

Almost surely, 2^50721505 is an apocalyptic number.

It is an amenable number.

50721505 is a deficient number, since it is larger than the sum of its proper divisors (10144307).

50721505 is a wasteful number, since it uses less digits than its factorization.

50721505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144306.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 50721505 is about 7121.9031866489. The cubic root of 50721505 is about 370.1667254450.

The spelling of 50721505 in words is "fifty million, seven hundred twenty-one thousand, five hundred five".