50981 has 4 divisors (see below), whose sum is σ = 58272. Its totient is φ = 43692.

The previous prime is 50971. The next prime is 50989. The reversal of 50981 is 18905.

50981 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50981 - 2¹⁰ = 49957 is a prime.

It is a super-2 number, since 2×50981² = 5198124722, which contains 22 as substring.

It is an Ulam number.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 50981.

It is not an unprimeable number, because it can be changed into a prime (50989) 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, 3635 + ... + 3648.

It is an arithmetic number, because the mean of its divisors is an integer number (14568).

2⁵⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

50981 is a deficient number, since it is larger than the sum of its proper divisors (7291).

50981 is an equidigital number, since it uses as much as digits as its factorization.

50981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 50981 is about 225.7897251870. The cubic root of 50981 is about 37.0796918811.

The spelling of 50981 in words is "fifty thousand, nine hundred eighty-one".