161606109 has 16 divisors (see below), whose sum is σ = 247500800. Its totient is φ = 91879920.

The previous prime is 161606087. The next prime is 161606117. The reversal of 161606109 is 901606161.

It is a happy number.

It is not a de Polignac number, because 161606109 - 2⁸ = 161605853 is a prime.

It is a super-2 number, since 2×161606109² = 52233068932239762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606149) 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, 15157 + ... + 23514.

It is an arithmetic number, because the mean of its divisors is an integer number (15468800).

Almost surely, 2^161606109 is an apocalyptic number.

It is an amenable number.

161606109 is a deficient number, since it is larger than the sum of its proper divisors (85894691).

161606109 is a wasteful number, since it uses less digits than its factorization.

161606109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38880.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 161606109 is about 12712.4391443971. The cubic root of 161606109 is about 544.6939998694.

The spelling of 161606109 in words is "one hundred sixty-one million, six hundred six thousand, one hundred nine".