161381165 has 16 divisors (see below), whose sum is σ = 212163840. Its totient is φ = 116867520.

The previous prime is 161381141. The next prime is 161381183. The reversal of 161381165 is 561183161.

It is not a de Polignac number, because 161381165 - 2⁸ = 161380909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7007 + ... + 19283.

It is an arithmetic number, because the mean of its divisors is an integer number (13260240).

Almost surely, 2^161381165 is an apocalyptic number.

It is an amenable number.

161381165 is a deficient number, since it is larger than the sum of its proper divisors (50782675).

161381165 is a wasteful number, since it uses less digits than its factorization.

161381165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12532.

The product of its digits is 4320, while the sum is 32.

The square root of 161381165 is about 12703.5886661998. The cubic root of 161381165 is about 544.4411576537.

The spelling of 161381165 in words is "one hundred sixty-one million, three hundred eighty-one thousand, one hundred sixty-five".