331666849 has 4 divisors (see below), whose sum is σ = 332153136. Its totient is φ = 331180564.

The previous prime is 331666847. The next prime is 331666897. The reversal of 331666849 is 948666133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 331666849 - 2¹ = 331666847 is a prime.

It is a super-2 number, since 2×331666849² = 220005797451177602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331666799 and 331666808.

It is not an unprimeable number, because it can be changed into a prime (331666847) 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, 242119 + ... + 243484.

It is an arithmetic number, because the mean of its divisors is an integer number (83038284).

Almost surely, 2^331666849 is an apocalyptic number.

It is an amenable number.

331666849 is a deficient number, since it is larger than the sum of its proper divisors (486287).

331666849 is an equidigital number, since it uses as much as digits as its factorization.

331666849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486286.

The product of its digits is 559872, while the sum is 46.

The square root of 331666849 is about 18211.7228454641. The cubic root of 331666849 is about 692.2038677013.

The spelling of 331666849 in words is "three hundred thirty-one million, six hundred sixty-six thousand, eight hundred forty-nine".