6690949 has 2 divisors, whose sum is σ = 6690950. Its totient is φ = 6690948.

The previous prime is 6690941. The next prime is 6690973. The reversal of 6690949 is 9490966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4334724 + 2356225 = 2082^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 6690949 - 2³ = 6690941 is a prime.

6690949 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6690941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345474 + 3345475.

It is an arithmetic number, because the mean of its divisors is an integer number (3345475).

Almost surely, 2^6690949 is an apocalyptic number.

It is an amenable number.

6690949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690949 is an equidigital number, since it uses as much as digits as its factorization.

6690949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 6690949 is about 2586.6868770688. The cubic root of 6690949 is about 188.4354344092.

The spelling of 6690949 in words is "six million, six hundred ninety thousand, nine hundred forty-nine".