1608887161 has 4 divisors (see below), whose sum is σ = 1838728192. Its totient is φ = 1379046132.

The previous prime is 1608887131. The next prime is 1608887167. The reversal of 1608887161 is 1617888061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1608887161 - 2⁵ = 1608887129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1608887167) 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, 114920505 + ... + 114920518.

It is an arithmetic number, because the mean of its divisors is an integer number (459682048).

Almost surely, 2^1608887161 is an apocalyptic number.

It is an amenable number.

1608887161 is a deficient number, since it is larger than the sum of its proper divisors (229841031).

1608887161 is an equidigital number, since it uses as much as digits as its factorization.

1608887161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229841030.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1608887161 is about 40110.9356784406. The cubic root of 1608887161 is about 1171.7686162067.

The spelling of 1608887161 in words is "one billion, six hundred eight million, eight hundred eighty-seven thousand, one hundred sixty-one".