838391161 has 2 divisors, whose sum is σ = 838391162. Its totient is φ = 838391160.

The previous prime is 838391119. The next prime is 838391173. The reversal of 838391161 is 161193838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809971600 + 28419561 = 28460^2 + 5331^2 .

It is a cyclic number.

It is not a de Polignac number, because 838391161 - 2¹⁵ = 838358393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (838391111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419195580 + 419195581.

It is an arithmetic number, because the mean of its divisors is an integer number (419195581).

Almost surely, 2^838391161 is an apocalyptic number.

It is an amenable number.

838391161 is a deficient number, since it is larger than the sum of its proper divisors (1).

838391161 is an equidigital number, since it uses as much as digits as its factorization.

838391161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 838391161 is about 28954.9850802932. The cubic root of 838391161 is about 942.9360293249.

The spelling of 838391161 in words is "eight hundred thirty-eight million, three hundred ninety-one thousand, one hundred sixty-one".