850138808291 has 2 divisors, whose sum is σ = 850138808292. Its totient is φ = 850138808290.

The previous prime is 850138808191. The next prime is 850138808317. The reversal of 850138808291 is 192808831058.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850138808291 is a prime.

It is not a weakly prime, because it can be changed into another prime (850138808191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425069404145 + 425069404146.

It is an arithmetic number, because the mean of its divisors is an integer number (425069404146).

Almost surely, 2^850138808291 is an apocalyptic number.

850138808291 is a deficient number, since it is larger than the sum of its proper divisors (1).

850138808291 is an equidigital number, since it uses as much as digits as its factorization.

850138808291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 850138808291 in words is "eight hundred fifty billion, one hundred thirty-eight million, eight hundred eight thousand, two hundred ninety-one".