840339161 has 2 divisors, whose sum is σ = 840339162. Its totient is φ = 840339160.

The previous prime is 840339139. The next prime is 840339197. The reversal of 840339161 is 161933048.

840339161 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., 538240000 + 302099161 = 23200^2 + 17381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840339161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840339131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420169580 + 420169581.

It is an arithmetic number, because the mean of its divisors is an integer number (420169581).

Almost surely, 2^840339161 is an apocalyptic number.

It is an amenable number.

840339161 is a deficient number, since it is larger than the sum of its proper divisors (1).

840339161 is an equidigital number, since it uses as much as digits as its factorization.

840339161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 840339161 is about 28988.6039850145. The cubic root of 840339161 is about 943.6657676909.

The spelling of 840339161 in words is "eight hundred forty million, three hundred thirty-nine thousand, one hundred sixty-one".