6699949 has 2 divisors, whose sum is σ = 6699950. Its totient is φ = 6699948.

The previous prime is 6699947. The next prime is 6699961. The reversal of 6699949 is 9499966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 499849 = 2490^2 + 707^2 .

It is a cyclic number.

It is not a de Polignac number, because 6699949 - 2¹ = 6699947 is a prime.

Together with 6699947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6699896 and 6699905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6699941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349974 + 3349975.

It is an arithmetic number, because the mean of its divisors is an integer number (3349975).

Almost surely, 2^6699949 is an apocalyptic number.

It is an amenable number.

6699949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6699949 is an equidigital number, since it uses as much as digits as its factorization.

6699949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 52.

The square root of 6699949 is about 2588.4259695807. The cubic root of 6699949 is about 188.5198847656.

The spelling of 6699949 in words is "six million, six hundred ninety-nine thousand, nine hundred forty-nine".