156318161 has 2 divisors, whose sum is σ = 156318162. Its totient is φ = 156318160.

The previous prime is 156318157. The next prime is 156318167. The reversal of 156318161 is 161813651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117180625 + 39137536 = 10825^2 + 6256^2 .

It is a cyclic number.

It is not a de Polignac number, because 156318161 - 2² = 156318157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156318167) 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, 78159080 + 78159081.

It is an arithmetic number, because the mean of its divisors is an integer number (78159081).

Almost surely, 2^156318161 is an apocalyptic number.

It is an amenable number.

156318161 is a deficient number, since it is larger than the sum of its proper divisors (1).

156318161 is an equidigital number, since it uses as much as digits as its factorization.

156318161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 156318161 is about 12502.7261427258. The cubic root of 156318161 is about 538.6869802812.

The spelling of 156318161 in words is "one hundred fifty-six million, three hundred eighteen thousand, one hundred sixty-one".