161100331 has 8 divisors (see below), whose sum is σ = 189091040. Its totient is φ = 134353728.

The previous prime is 161100323. The next prime is 161100341. The reversal of 161100331 is 133001161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161100331 - 2³ = 161100323 is a prime.

It is a super-2 number, since 2×161100331² = 51906633296619122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161100341) 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 7 ways as a sum of consecutive naturals, for example, 310746 + ... + 311263.

It is an arithmetic number, because the mean of its divisors is an integer number (23636380).

Almost surely, 2^161100331 is an apocalyptic number.

161100331 is a deficient number, since it is larger than the sum of its proper divisors (27990709).

161100331 is an equidigital number, since it uses as much as digits as its factorization.

161100331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622053.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 161100331 is about 12692.5305199554. The cubic root of 161100331 is about 544.1251638092.

Adding to 161100331 its reverse (133001161), we get a palindrome (294101492).

The spelling of 161100331 in words is "one hundred sixty-one million, one hundred thousand, three hundred thirty-one".