50939135809 has 3 divisors (see below), whose sum is σ = 50939361507. Its totient is φ = 50938910112.

The previous prime is 50939135791. The next prime is 50939135833. The reversal of 50939135809 is 90853193905.

It is a happy number.

The square root of 50939135809 is 225697.

It is a perfect power (a square), and thus also a powerful number.

50939135809 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 28417530625 + 22521605184 = 168575^2 + 150072^2 .

It is not a de Polignac number, because 50939135809 - 2⁵ = 50939135777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50939135839) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 112849 + ... + 338545.

It is an arithmetic number, because the mean of its divisors is an integer number (16979787169).

Almost surely, 2^50939135809 is an apocalyptic number.

50939135809 is the 225697-th square number.

50939135809 is the 112849-th centered octagonal number.

It is an amenable number.

50939135809 is a deficient number, since it is larger than the sum of its proper divisors (225698).

50939135809 is an frugal number, since it uses more digits than its factorization.

50939135809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451394 (or 225697 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 52.

The spelling of 50939135809 in words is "fifty billion, nine hundred thirty-nine million, one hundred thirty-five thousand, eight hundred nine".