161912205 has 96 divisors (see below), whose sum is σ = 363767040. Its totient is φ = 64696320.

The previous prime is 161912183. The next prime is 161912207. The reversal of 161912205 is 502219161.

161912205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161912205 - 2⁷ = 161912077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161912207) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 76765 + ... + 78845.

It is an arithmetic number, because the mean of its divisors is an integer number (3789240).

Almost surely, 2^161912205 is an apocalyptic number.

161912205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161912205 is an abundant number, since it is smaller than the sum of its proper divisors (201854835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161912205 is a wasteful number, since it uses less digits than its factorization.

161912205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161912205 is about 12724.4726806261. The cubic root of 161912205 is about 545.0376822134.

It can be divided in two parts, 1619 and 12205, that added together give a cube (13824 = 24³).

The spelling of 161912205 in words is "one hundred sixty-one million, nine hundred twelve thousand, two hundred five".