161106181 has 2 divisors, whose sum is σ = 161106182. Its totient is φ = 161106180.

The previous prime is 161106137. The next prime is 161106193. The reversal of 161106181 is 181601161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160022500 + 1083681 = 12650^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 161106181 - 2¹¹ = 161104133 is a prime.

It is a super-2 number, since 2×161106181² = 51910403112809522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161136181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80553090 + 80553091.

It is an arithmetic number, because the mean of its divisors is an integer number (80553091).

Almost surely, 2^161106181 is an apocalyptic number.

It is an amenable number.

161106181 is a deficient number, since it is larger than the sum of its proper divisors (1).

161106181 is an equidigital number, since it uses as much as digits as its factorization.

161106181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 161106181 is about 12692.7609683630. The cubic root of 161106181 is about 544.1317499610.

The spelling of 161106181 in words is "one hundred sixty-one million, one hundred six thousand, one hundred eighty-one".