331612161 has 8 divisors (see below), whose sum is σ = 445331040. Its totient is φ = 219484032.

The previous prime is 331612159. The next prime is 331612243. The reversal of 331612161 is 161216133.

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

It is not a de Polignac number, because 331612161 - 2¹ = 331612159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (331610161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397200 + ... + 398033.

It is an arithmetic number, because the mean of its divisors is an integer number (55666380).

It is a Proth number, since it is equal to 1265 ⋅ 2¹⁸ + 1 and 1265 < 2¹⁸.

Almost surely, 2^331612161 is an apocalyptic number.

It is an amenable number.

331612161 is a deficient number, since it is larger than the sum of its proper divisors (113718879).

331612161 is a wasteful number, since it uses less digits than its factorization.

331612161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795375.

The product of its digits is 648, while the sum is 24.

The square root of 331612161 is about 18210.2213330865. The cubic root of 331612161 is about 692.1658201585.

Adding to 331612161 its reverse (161216133), we get a palindrome (492828294).

The spelling of 331612161 in words is "three hundred thirty-one million, six hundred twelve thousand, one hundred sixty-one".