161345305 has 16 divisors (see below), whose sum is σ = 214682688. Its totient is φ = 115416000.

The previous prime is 161345293. The next prime is 161345309. The reversal of 161345305 is 503543161.

It is not a de Polignac number, because 161345305 - 2⁵ = 161345273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161345309) by changing a digit.

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, 20691 + ... + 27400.

It is an arithmetic number, because the mean of its divisors is an integer number (13417668).

Almost surely, 2^161345305 is an apocalyptic number.

It is an amenable number.

161345305 is a deficient number, since it is larger than the sum of its proper divisors (53337383).

161345305 is a wasteful number, since it uses less digits than its factorization.

161345305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48168.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 161345305 is about 12702.1771755869. The cubic root of 161345305 is about 544.4008284819.

Adding to 161345305 its reverse (503543161), we get a palindrome (664888466).

It can be divided in two parts, 161345 and 305, that multiplied together give a square (49210225 = 7015²).

The spelling of 161345305 in words is "one hundred sixty-one million, three hundred forty-five thousand, three hundred five".