6690331 has 2 divisors, whose sum is σ = 6690332. Its totient is φ = 6690330.

The previous prime is 6690323. The next prime is 6690347. The reversal of 6690331 is 1330966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6690331 - 2³ = 6690323 is a prime.

It is a super-2 number, since 2×6690331² = 89521057779122, which contains 22 as substring.

6690331 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6690331.

It is not a weakly prime, because it can be changed into another prime (6690361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345165 + 3345166.

It is an arithmetic number, because the mean of its divisors is an integer number (3345166).

Almost surely, 2^6690331 is an apocalyptic number.

6690331 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690331 is an equidigital number, since it uses as much as digits as its factorization.

6690331 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6690331 is about 2586.5674164808. The cubic root of 6690331 is about 188.4296327068.

It can be divided in two parts, 6690 and 331, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 6690331 in words is "six million, six hundred ninety thousand, three hundred thirty-one".