50989978309 has 2 divisors, whose sum is σ = 50989978310. Its totient is φ = 50989978308.

The previous prime is 50989978289. The next prime is 50989978343. The reversal of 50989978309 is 90387998905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27056960100 + 23933018209 = 164490^2 + 154703^2 .

It is a cyclic number.

It is not a de Polignac number, because 50989978309 - 2⁷ = 50989978181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50989978399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25494989154 + 25494989155.

It is an arithmetic number, because the mean of its divisors is an integer number (25494989155).

Almost surely, 2^50989978309 is an apocalyptic number.

It is an amenable number.

50989978309 is a deficient number, since it is larger than the sum of its proper divisors (1).

50989978309 is an equidigital number, since it uses as much as digits as its factorization.

50989978309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44089920, while the sum is 67.

The spelling of 50989978309 in words is "fifty billion, nine hundred eighty-nine million, nine hundred seventy-eight thousand, three hundred nine".