840258161 has 2 divisors, whose sum is σ = 840258162. Its totient is φ = 840258160.

The previous prime is 840258157. The next prime is 840258173. The reversal of 840258161 is 161852048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531025936 + 309232225 = 23044^2 + 17585^2 .

It is a cyclic number.

It is not a de Polignac number, because 840258161 - 2² = 840258157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840258101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420129080 + 420129081.

It is an arithmetic number, because the mean of its divisors is an integer number (420129081).

Almost surely, 2^840258161 is an apocalyptic number.

It is an amenable number.

840258161 is a deficient number, since it is larger than the sum of its proper divisors (1).

840258161 is an equidigital number, since it uses as much as digits as its factorization.

840258161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 840258161 is about 28987.2068506091. The cubic root of 840258161 is about 943.6354468448.

The spelling of 840258161 in words is "eight hundred forty million, two hundred fifty-eight thousand, one hundred sixty-one".