161817946 has 32 divisors (see below), whose sum is σ = 266267520. Its totient is φ = 73483200.

The previous prime is 161817937. The next prime is 161817947. The reversal of 161817946 is 649718161.

It is not an unprimeable number, because it can be changed into a prime (161817947) 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 15 ways as a sum of consecutive naturals, for example, 99016 + ... + 100636.

It is an arithmetic number, because the mean of its divisors is an integer number (8320860).

Almost surely, 2^161817946 is an apocalyptic number.

161817946 is a deficient number, since it is larger than the sum of its proper divisors (104449574).

161817946 is a wasteful number, since it uses less digits than its factorization.

161817946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

The product of its digits is 72576, while the sum is 43.

The square root of 161817946 is about 12720.7682944074. The cubic root of 161817946 is about 544.9318950893.

The spelling of 161817946 in words is "one hundred sixty-one million, eight hundred seventeen thousand, nine hundred forty-six".