50781 has 4 divisors (see below), whose sum is σ = 67712. Its totient is φ = 33852.

The previous prime is 50777. The next prime is 50789. The reversal of 50781 is 18705.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 50781 - 2² = 50777 is a prime.

It is a super-2 number, since 2×50781² = 5157419922, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8461 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (16928).

2⁵⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

50781 is a deficient number, since it is larger than the sum of its proper divisors (16931).

50781 is a wasteful number, since it uses less digits than its factorization.

50781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16930.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 50781 is about 225.3464000156. The cubic root of 50781 is about 37.0311400858.

The spelling of 50781 in words is "fifty thousand, seven hundred eighty-one".