50839981 has 2 divisors, whose sum is σ = 50839982. Its totient is φ = 50839980.

The previous prime is 50839967. The next prime is 50840003. The reversal of 50839981 is 18993805.

50839981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36844900 + 13995081 = 6070^2 + 3741^2 .

It is a cyclic number.

It is not a de Polignac number, because 50839981 - 2⁵ = 50839949 is a prime.

It is a super-2 number, since 2×50839981² = 5169407336160722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50839951) 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 as a sum of consecutive naturals, namely, 25419990 + 25419991.

It is an arithmetic number, because the mean of its divisors is an integer number (25419991).

Almost surely, 2^50839981 is an apocalyptic number.

It is an amenable number.

50839981 is a deficient number, since it is larger than the sum of its proper divisors (1).

50839981 is an equidigital number, since it uses as much as digits as its factorization.

50839981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 50839981 is about 7130.2160556325. The cubic root of 50839981 is about 370.4547148677.

The spelling of 50839981 in words is "fifty million, eight hundred thirty-nine thousand, nine hundred eighty-one".