331066 has 4 divisors (see below), whose sum is σ = 496602. Its totient is φ = 165532.

The previous prime is 331063. The next prime is 331081. The reversal of 331066 is 660133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660133 = 389 ⋅1697.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 441 = 575^2 + 21^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (331063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82765 + ... + 82768.

2³³¹⁰⁶⁶ is an apocalyptic number.

331066 is a deficient number, since it is larger than the sum of its proper divisors (165536).

331066 is a wasteful number, since it uses less digits than its factorization.

331066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165535.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 331066 is about 575.3833504717. The cubic root of 331066 is about 69.1785615258.

Adding to 331066 its reverse (660133), we get a palindrome (991199).

The spelling of 331066 in words is "three hundred thirty-one thousand, sixty-six".