161105011 has 4 divisors (see below), whose sum is σ = 161477512. Its totient is φ = 160732512.

The previous prime is 161105003. The next prime is 161105029. The reversal of 161105011 is 110501161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161105011 - 2³ = 161105003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161105111) 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, 185601 + ... + 186466.

It is an arithmetic number, because the mean of its divisors is an integer number (40369378).

Almost surely, 2^161105011 is an apocalyptic number.

161105011 is a deficient number, since it is larger than the sum of its proper divisors (372501).

161105011 is an equidigital number, since it uses as much as digits as its factorization.

161105011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372500.

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 161105011 is about 12692.7148790162. The cubic root of 161105011 is about 544.1304327434.

Adding to 161105011 its reverse (110501161), we get a palindrome (271606172).

The spelling of 161105011 in words is "one hundred sixty-one million, one hundred five thousand, eleven".