1608381161 has 4 divisors (see below), whose sum is σ = 1608585300. Its totient is φ = 1608177024.

The previous prime is 1608381149. The next prime is 1608381193. The reversal of 1608381161 is 1611838061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221265625 + 1387115536 = 14875^2 + 37244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608381161 - 2⁶ = 1608381097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1608381121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89756 + ... + 106173.

It is an arithmetic number, because the mean of its divisors is an integer number (402146325).

Almost surely, 2^1608381161 is an apocalyptic number.

It is an amenable number.

1608381161 is a deficient number, since it is larger than the sum of its proper divisors (204139).

1608381161 is an equidigital number, since it uses as much as digits as its factorization.

1608381161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204138.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1608381161 is about 40104.6276756187. The cubic root of 1608381161 is about 1171.6457617056.

The spelling of 1608381161 in words is "one billion, six hundred eight million, three hundred eighty-one thousand, one hundred sixty-one".