6690143 has 2 divisors, whose sum is σ = 6690144. Its totient is φ = 6690142.

The previous prime is 6690119. The next prime is 6690149. The reversal of 6690143 is 3410966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6690143 - 2¹² = 6686047 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6690149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345071 + 3345072.

It is an arithmetic number, because the mean of its divisors is an integer number (3345072).

Almost surely, 2^6690143 is an apocalyptic number.

6690143 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690143 is an equidigital number, since it uses as much as digits as its factorization.

6690143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 6690143 is about 2586.5310746249. The cubic root of 6690143 is about 188.4278677168.

It can be divided in two parts, 66 and 90143, that added together give a palindrome (90209).

The spelling of 6690143 in words is "six million, six hundred ninety thousand, one hundred forty-three".