849836638949 has 2 divisors, whose sum is σ = 849836638950. Its totient is φ = 849836638948.

The previous prime is 849836638939. The next prime is 849836638961. The reversal of 849836638949 is 949836638948.

849836638949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817622850625 + 32213788324 = 904225^2 + 179482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849836638949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 849836638949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849836638939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424918319474 + 424918319475.

It is an arithmetic number, because the mean of its divisors is an integer number (424918319475).

Almost surely, 2^849836638949 is an apocalyptic number.

It is an amenable number.

849836638949 is a deficient number, since it is larger than the sum of its proper divisors (1).

849836638949 is an equidigital number, since it uses as much as digits as its factorization.

849836638949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1934917632, while the sum is 77.

Subtracting 849836638949 from its reverse (949836638948), we obtain a palindrome (99999999999).

The spelling of 849836638949 in words is "eight hundred forty-nine billion, eight hundred thirty-six million, six hundred thirty-eight thousand, nine hundred forty-nine".