161012172 has 12 divisors (see below), whose sum is σ = 375695096. Its totient is φ = 53670720.

The previous prime is 161012129. The next prime is 161012221. The reversal of 161012172 is 271210161.

It is a happy number.

161012172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6708829 + ... + 6708852.

Almost surely, 2^161012172 is an apocalyptic number.

161012172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161012172 is an abundant number, since it is smaller than the sum of its proper divisors (214682924).

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

161012172 is a wasteful number, since it uses less digits than its factorization.

161012172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13417688 (or 13417686 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 161012172 is about 12689.0571753775. The cubic root of 161012172 is about 544.0258917535.

The spelling of 161012172 in words is "one hundred sixty-one million, twelve thousand, one hundred seventy-two".