161905108 has 6 divisors (see below), whose sum is σ = 283333946. Its totient is φ = 80952552.

The previous prime is 161905103. The next prime is 161905109. The reversal of 161905108 is 801509161.

It can be written as a sum of positive squares in only one way, i.e., 91814724 + 70090384 = 9582^2 + 8372^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161905108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161905103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20238135 + ... + 20238142.

Almost surely, 2^161905108 is an apocalyptic number.

It is an amenable number.

161905108 is a deficient number, since it is larger than the sum of its proper divisors (121428838).

161905108 is a wasteful number, since it uses less digits than its factorization.

161905108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40476281 (or 40476279 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 161905108 is about 12724.1938055030. The cubic root of 161905108 is about 545.0297186611.

The spelling of 161905108 in words is "one hundred sixty-one million, nine hundred five thousand, one hundred eight".