331945 has 8 divisors (see below), whose sum is σ = 401544. Its totient is φ = 263424.

The previous prime is 331943. The next prime is 331957. The reversal of 331945 is 549133.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 249001 = 288^2 + 499^2 .

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 331945 - 2¹ = 331943 is a prime.

It is a super-2 number, since 2×331945² = 220374966050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331943) 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, 817 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (50193).

2³³¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

331945 is a deficient number, since it is larger than the sum of its proper divisors (69599).

331945 is a wasteful number, since it uses less digits than its factorization.

331945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its digits is 1620, while the sum is 25.

The square root of 331945 is about 576.1466827120. The cubic root of 331945 is about 69.2397318248.

It can be divided in two parts, 3319 and 45, that added together give a square (3364 = 58²).

The spelling of 331945 in words is "three hundred thirty-one thousand, nine hundred forty-five".