161948136 has 128 divisors (see below), whose sum is σ = 479232000. Its totient is φ = 45581760.

The previous prime is 161948119. The next prime is 161948159. The reversal of 161948136 is 631849161.

Its product of digits (31104) is a multiple of the sum of its prime factors (324).

It is a junction number, because it is equal to n+sod(n) for n = 161948094 and 161948103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847801 + ... + 847991.

It is an arithmetic number, because the mean of its divisors is an integer number (3744000).

Almost surely, 2^161948136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161948136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239616000).

161948136 is an abundant number, since it is smaller than the sum of its proper divisors (317283864).

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

161948136 is a wasteful number, since it uses less digits than its factorization.

161948136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 306 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 161948136 is about 12725.8844879246. The cubic root of 161948136 is about 545.0779968611.

The spelling of 161948136 in words is "one hundred sixty-one million, nine hundred forty-eight thousand, one hundred thirty-six".