161106161 has 8 divisors (see below), whose sum is σ = 171015624. Its totient is φ = 151244800.

The previous prime is 161106137. The next prime is 161106181. The reversal of 161106161 is 161601161.

It can be written as a sum of positive squares in 4 ways, for example, as 131239936 + 29866225 = 11456^2 + 5465^2 .

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 161106161 - 2¹⁸ = 160844017 is a prime.

It is a super-2 number, since 2×161106161² = 51910390224315842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161106181) 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 7 ways as a sum of consecutive naturals, for example, 5000 + ... + 18633.

It is an arithmetic number, because the mean of its divisors is an integer number (21376953).

Almost surely, 2^161106161 is an apocalyptic number.

It is an amenable number.

161106161 is a deficient number, since it is larger than the sum of its proper divisors (9909463).

161106161 is a wasteful number, since it uses less digits than its factorization.

161106161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24051.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 161106161 is about 12692.7601805124. The cubic root of 161106161 is about 544.1317274445.

The spelling of 161106161 in words is "one hundred sixty-one million, one hundred six thousand, one hundred sixty-one".