850109345389 has 2 divisors, whose sum is σ = 850109345390. Its totient is φ = 850109345388.

The previous prime is 850109345387. The next prime is 850109345417. The reversal of 850109345389 is 983543901058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833806396900 + 16302948489 = 913130^2 + 127683^2 .

It is a cyclic number.

It is not a de Polignac number, because 850109345389 - 2¹ = 850109345387 is a prime.

It is a super-2 number, since 2×850109345389² (a number of 25 digits) contains 22 as substring.

Together with 850109345387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850109345387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425054672694 + 425054672695.

It is an arithmetic number, because the mean of its divisors is an integer number (425054672695).

Almost surely, 2^850109345389 is an apocalyptic number.

It is an amenable number.

850109345389 is a deficient number, since it is larger than the sum of its proper divisors (1).

850109345389 is an equidigital number, since it uses as much as digits as its factorization.

850109345389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 850109345389 in words is "eight hundred fifty billion, one hundred nine million, three hundred forty-five thousand, three hundred eighty-nine".