161817450 has 48 divisors (see below), whose sum is σ = 402161760. Its totient is φ = 43059520.

The previous prime is 161817379. The next prime is 161817451. The reversal of 161817450 is 54718161.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161817451) 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 23 ways as a sum of consecutive naturals, for example, 98032 + ... + 99668.

It is an arithmetic number, because the mean of its divisors is an integer number (8378370).

Almost surely, 2^161817450 is an apocalyptic number.

161817450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161817450 is an abundant number, since it is smaller than the sum of its proper divisors (240344310).

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

161817450 is a wasteful number, since it uses less digits than its factorization.

161817450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 161817450 is about 12720.7487987146. The cubic root of 161817450 is about 544.9313383186.

The spelling of 161817450 in words is "one hundred sixty-one million, eight hundred seventeen thousand, four hundred fifty".