50911581 has 16 divisors (see below), whose sum is σ = 80953344. Its totient is φ = 27827184.

The previous prime is 50911577. The next prime is 50911589. The reversal of 50911581 is 18511905.

50911581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 50911581 - 2² = 50911577 is a prime.

It is a super-2 number, since 2×50911581² = 5183978159839122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50911589) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52221 + ... + 53186.

It is an arithmetic number, because the mean of its divisors is an integer number (5059584).

Almost surely, 2^50911581 is an apocalyptic number.

It is an amenable number.

50911581 is a deficient number, since it is larger than the sum of its proper divisors (30041763).

50911581 is a wasteful number, since it uses less digits than its factorization.

50911581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105440.

The product of its (nonzero) digits is 1800, while the sum is 30.

The square root of 50911581 is about 7135.2351748208. The cubic root of 50911581 is about 370.6285420730.

It can be divided in two parts, 509 and 11581, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 50911581 in words is "fifty million, nine hundred eleven thousand, five hundred eighty-one".