161322005 has 8 divisors (see below), whose sum is σ = 208477752. Its totient is φ = 119130048.

The previous prime is 161321971. The next prime is 161322013. The reversal of 161322005 is 500223161.

It can be written as a sum of positive squares in 4 ways, for example, as 8898289 + 152423716 = 2983^2 + 12346^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161322005 - 2¹² = 161317909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1240874 + ... + 1241003.

It is an arithmetic number, because the mean of its divisors is an integer number (26059719).

Almost surely, 2^161322005 is an apocalyptic number.

It is an amenable number.

161322005 is a deficient number, since it is larger than the sum of its proper divisors (47155747).

161322005 is a wasteful number, since it uses less digits than its factorization.

161322005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481895.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 161322005 is about 12701.2599768684. The cubic root of 161322005 is about 544.3746214390.

Adding to 161322005 its reverse (500223161), we get a palindrome (661545166).

The spelling of 161322005 in words is "one hundred sixty-one million, three hundred twenty-two thousand, five".