50890891861 has 2 divisors, whose sum is σ = 50890891862. Its totient is φ = 50890891860.

The previous prime is 50890891853. The next prime is 50890891903. The reversal of 50890891861 is 16819809805.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47624769361 + 3266122500 = 218231^2 + 57150^2 .

It is a cyclic number.

It is not a de Polignac number, because 50890891861 - 2³ = 50890891853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50890891061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25445445930 + 25445445931.

It is an arithmetic number, because the mean of its divisors is an integer number (25445445931).

Almost surely, 2^50890891861 is an apocalyptic number.

It is an amenable number.

50890891861 is a deficient number, since it is larger than the sum of its proper divisors (1).

50890891861 is an equidigital number, since it uses as much as digits as its factorization.

50890891861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 55.

The spelling of 50890891861 in words is "fifty billion, eight hundred ninety million, eight hundred ninety-one thousand, eight hundred sixty-one".