331966 has 4 divisors (see below), whose sum is σ = 497952. Its totient is φ = 165982.

The previous prime is 331957. The next prime is 331967. The reversal of 331966 is 669133.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×331966² = 220402850312, which contains 22 as substring.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82990 + ... + 82993.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2³³¹⁹⁶⁶ is an apocalyptic number.

331966 is a deficient number, since it is larger than the sum of its proper divisors (165986).

331966 is a wasteful number, since it uses less digits than its factorization.

331966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165985.

The product of its digits is 2916, while the sum is 28.

The square root of 331966 is about 576.1649069494. The cubic root of 331966 is about 69.2411919097.

The spelling of 331966 in words is "three hundred thirty-one thousand, nine hundred sixty-six".