161975496 has 128 divisors (see below), whose sum is σ = 439971840. Its totient is φ = 49593600.

The previous prime is 161975491. The next prime is 161975497. The reversal of 161975496 is 694579161.

It is a happy number.

It is a super-2 number, since 2×161975496² = 52472122608892032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161975491) by changing a digit.

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, 1951471 + ... + 1951553.

It is an arithmetic number, because the mean of its divisors is an integer number (3437280).

Almost surely, 2^161975496 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 161975496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219985920).

161975496 is an abundant number, since it is smaller than the sum of its proper divisors (277996344).

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

161975496 is a wasteful number, since it uses less digits than its factorization.

161975496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 223 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 161975496 is about 12726.9594169228. The cubic root of 161975496 is about 545.1086908322.

The spelling of 161975496 in words is "one hundred sixty-one million, nine hundred seventy-five thousand, four hundred ninety-six".