161934945 has 16 divisors (see below), whose sum is σ = 274337280. Its totient is φ = 81284864.

The previous prime is 161934943. The next prime is 161934991. The reversal of 161934945 is 549439161.

It is a cyclic number.

It is not a de Polignac number, because 161934945 - 2¹ = 161934943 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 161934897 and 161934906.

It is not an unprimeable number, because it can be changed into a prime (161934943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317265 + ... + 317774.

It is an arithmetic number, because the mean of its divisors is an integer number (17146080).

Almost surely, 2^161934945 is an apocalyptic number.

161934945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161934945 is a deficient number, since it is larger than the sum of its proper divisors (112402335).

161934945 is a wasteful number, since it uses less digits than its factorization.

161934945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635064.

The product of its digits is 116640, while the sum is 42.

The square root of 161934945 is about 12725.3662029821. The cubic root of 161934945 is about 545.0631972278.

The spelling of 161934945 in words is "one hundred sixty-one million, nine hundred thirty-four thousand, nine hundred forty-five".