50169781 has 2 divisors, whose sum is σ = 50169782. Its totient is φ = 50169780.

The previous prime is 50169767. The next prime is 50169799. The reversal of 50169781 is 18796105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42380100 + 7789681 = 6510^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 50169781 - 2⁹ = 50169269 is a prime.

It is a super-2 number, since 2×50169781² = 5034013851175922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 50169781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50169701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25084890 + 25084891.

It is an arithmetic number, because the mean of its divisors is an integer number (25084891).

Almost surely, 2^50169781 is an apocalyptic number.

It is an amenable number.

50169781 is a deficient number, since it is larger than the sum of its proper divisors (1).

50169781 is an equidigital number, since it uses as much as digits as its factorization.

50169781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 50169781 is about 7083.0629673892. The cubic root of 50169781 is about 368.8196644786.

The spelling of 50169781 in words is "fifty million, one hundred sixty-nine thousand, seven hundred eighty-one".