50981639 has 8 divisors (see below), whose sum is σ = 54915072. Its totient is φ = 47191320.

The previous prime is 50981629. The next prime is 50981641. The reversal of 50981639 is 93618905.

50981639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50981639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50981596 and 50981605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50981629) 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 7 ways as a sum of consecutive naturals, for example, 35039 + ... + 36464.

It is an arithmetic number, because the mean of its divisors is an integer number (6864384).

Almost surely, 2^50981639 is an apocalyptic number.

50981639 is a deficient number, since it is larger than the sum of its proper divisors (3933433).

50981639 is a wasteful number, since it uses less digits than its factorization.

50981639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71557.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 50981639 is about 7140.1427856871. The cubic root of 50981639 is about 370.7984680038.

The spelling of 50981639 in words is "fifty million, nine hundred eighty-one thousand, six hundred thirty-nine".