161593105 has 4 divisors (see below), whose sum is σ = 193911732. Its totient is φ = 129274480.

The previous prime is 161593073. The next prime is 161593121. The reversal of 161593105 is 501395161.

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 30902481 + 130690624 = 5559^2 + 11432^2 .

It is not a de Polignac number, because 161593105 - 2⁵ = 161593073 is a prime.

It is a super-2 number, since 2×161593105² = 52224663167082050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 16159306 + ... + 16159315.

It is an arithmetic number, because the mean of its divisors is an integer number (48477933).

Almost surely, 2^161593105 is an apocalyptic number.

It is an amenable number.

161593105 is a deficient number, since it is larger than the sum of its proper divisors (32318627).

161593105 is an equidigital number, since it uses as much as digits as its factorization.

161593105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32318626.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 161593105 is about 12711.9276665658. The cubic root of 161593105 is about 544.6793894672.

The spelling of 161593105 in words is "one hundred sixty-one million, five hundred ninety-three thousand, one hundred five".