163561289 has 2 divisors, whose sum is σ = 163561290. Its totient is φ = 163561288.

The previous prime is 163561283. The next prime is 163561297. The reversal of 163561289 is 982165361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 2778889 = 12680^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 163561289 - 2⁸ = 163561033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163561283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81780644 + 81780645.

It is an arithmetic number, because the mean of its divisors is an integer number (81780645).

Almost surely, 2^163561289 is an apocalyptic number.

It is an amenable number.

163561289 is a deficient number, since it is larger than the sum of its proper divisors (1).

163561289 is an equidigital number, since it uses as much as digits as its factorization.

163561289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 163561289 is about 12789.1082175420. The cubic root of 163561289 is about 546.8818474636.

The spelling of 163561289 in words is "one hundred sixty-three million, five hundred sixty-one thousand, two hundred eighty-nine".