161969118 has 32 divisors (see below), whose sum is σ = 339379200. Its totient is φ = 51463776.

The previous prime is 161969099. The next prime is 161969153. The reversal of 161969118 is 811969161.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 161969118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7855 + ... + 19637.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600).

Almost surely, 2^161969118 is an apocalyptic number.

161969118 is an abundant number, since it is smaller than the sum of its proper divisors (177410082).

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

161969118 is a wasteful number, since it uses less digits than its factorization.

161969118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896.

The product of its digits is 23328, while the sum is 42.

The square root of 161969118 is about 12726.7088440021. The cubic root of 161969118 is about 545.1015359457.

The spelling of 161969118 in words is "one hundred sixty-one million, nine hundred sixty-nine thousand, one hundred eighteen".