161217330 has 32 divisors (see below), whose sum is σ = 396361728. Its totient is φ = 41942400.

The previous prime is 161217283. The next prime is 161217347. The reversal of 161217330 is 33712161.

It is a self number, because there is not a number n which added to its sum of digits gives 161217330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64306 + ... + 66765.

It is an arithmetic number, because the mean of its divisors is an integer number (12386304).

Almost surely, 2^161217330 is an apocalyptic number.

161217330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161217330 is an abundant number, since it is smaller than the sum of its proper divisors (235144398).

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

161217330 is a wasteful number, since it uses less digits than its factorization.

161217330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131122.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 161217330 is about 12697.1386540433. The cubic root of 161217330 is about 544.2568554376.

Adding to 161217330 its reverse (33712161), we get a palindrome (194929491).

The spelling of 161217330 in words is "one hundred sixty-one million, two hundred seventeen thousand, three hundred thirty".