161404105 has 4 divisors (see below), whose sum is σ = 193684932. Its totient is φ = 129123280.

The previous prime is 161404099. The next prime is 161404123. The reversal of 161404105 is 501404161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501404161 = 293 ⋅1711277.

It can be written as a sum of positive squares in 2 ways, for example, as 34999056 + 126405049 = 5916^2 + 11243^2 .

It is not a de Polignac number, because 161404105 - 2³ = 161404097 is a prime.

It is a super-2 number, since 2×161404105² = 52102570221702050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16140406 + ... + 16140415.

It is an arithmetic number, because the mean of its divisors is an integer number (48421233).

Almost surely, 2^161404105 is an apocalyptic number.

It is an amenable number.

161404105 is a deficient number, since it is larger than the sum of its proper divisors (32280827).

161404105 is an equidigital number, since it uses as much as digits as its factorization.

161404105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32280826.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161404105 is about 12704.4915285894. The cubic root of 161404105 is about 544.4669534942.

Adding to 161404105 its reverse (501404161), we get a palindrome (662808266).

The spelling of 161404105 in words is "one hundred sixty-one million, four hundred four thousand, one hundred five".