331989433 has 4 divisors (see below), whose sum is σ = 334217700. Its totient is φ = 329761168.

The previous prime is 331989431. The next prime is 331989439. The reversal of 331989433 is 334989133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 334989133 = 19 ⋅17631007.

It can be written as a sum of positive squares in 2 ways, for example, as 161112249 + 170877184 = 12693^2 + 13072^2 .

It is a cyclic number.

It is not a de Polignac number, because 331989433 - 2¹ = 331989431 is a prime.

It is a super-2 number, since 2×331989433² = 220433967247322978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331989433.

It is not an unprimeable number, because it can be changed into a prime (331989431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113910 + ... + 1114207.

It is an arithmetic number, because the mean of its divisors is an integer number (83554425).

Almost surely, 2^331989433 is an apocalyptic number.

It is an amenable number.

331989433 is a deficient number, since it is larger than the sum of its proper divisors (2228267).

331989433 is a wasteful number, since it uses less digits than its factorization.

331989433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228266.

The product of its digits is 209952, while the sum is 43.

The square root of 331989433 is about 18220.5771862474. The cubic root of 331989433 is about 692.4282108328.

The spelling of 331989433 in words is "three hundred thirty-one million, nine hundred eighty-nine thousand, four hundred thirty-three".