161289906 has 8 divisors (see below), whose sum is σ = 322579824. Its totient is φ = 53763300.

The previous prime is 161289899. The next prime is 161289911. The reversal of 161289906 is 609982161.

161289906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

161289906 is an admirable number.

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 Curzon number.

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, 13440820 + ... + 13440831.

It is an arithmetic number, because the mean of its divisors is an integer number (40322478).

Almost surely, 2^161289906 is an apocalyptic number.

161289906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161289906 is a wasteful number, since it uses less digits than its factorization.

161289906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26881656.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 161289906 is about 12699.9962992121. The cubic root of 161289906 is about 544.3385134490.

The spelling of 161289906 in words is "one hundred sixty-one million, two hundred eighty-nine thousand, nine hundred six".