1608641161 has 2 divisors, whose sum is σ = 1608641162. Its totient is φ = 1608641160.

The previous prime is 1608641117. The next prime is 1608641173. The reversal of 1608641161 is 1611468061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1558670400 + 49970761 = 39480^2 + 7069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608641161 - 2⁷ = 1608641033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1608641261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804320580 + 804320581.

It is an arithmetic number, because the mean of its divisors is an integer number (804320581).

Almost surely, 2^1608641161 is an apocalyptic number.

It is an amenable number.

1608641161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608641161 is an equidigital number, since it uses as much as digits as its factorization.

1608641161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1608641161 is about 40107.8690658080. The cubic root of 1608641161 is about 1171.7088917423.

The spelling of 1608641161 in words is "one billion, six hundred eight million, six hundred forty-one thousand, one hundred sixty-one".