161004817 has 4 divisors (see below), whose sum is σ = 161243316. Its totient is φ = 160766320.

The previous prime is 161004769. The next prime is 161004829. The reversal of 161004817 is 718400161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718400161 = 17 ⋅42258833.

It can be written as a sum of positive squares in 2 ways, for example, as 99680256 + 61324561 = 9984^2 + 7831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161004817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161004847) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118234 + ... + 119587.

It is an arithmetic number, because the mean of its divisors is an integer number (40310829).

Almost surely, 2^161004817 is an apocalyptic number.

It is an amenable number.

161004817 is a deficient number, since it is larger than the sum of its proper divisors (238499).

161004817 is an equidigital number, since it uses as much as digits as its factorization.

161004817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238498.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 161004817 is about 12688.7673554211. The cubic root of 161004817 is about 544.0176079670.

Adding to 161004817 its reverse (718400161), we get a palindrome (879404978).

The spelling of 161004817 in words is "one hundred sixty-one million, four thousand, eight hundred seventeen".