6690913 has 4 divisors (see below), whose sum is σ = 6854148. Its totient is φ = 6527680.

The previous prime is 6690899. The next prime is 6690923. The reversal of 6690913 is 3190966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3190966 = 2 ⋅1595483.

It can be written as a sum of positive squares in 2 ways, for example, as 3621409 + 3069504 = 1903^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 6690913 - 2⁵ = 6690881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690923) 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, 81556 + ... + 81637.

It is an arithmetic number, because the mean of its divisors is an integer number (1713537).

Almost surely, 2^6690913 is an apocalyptic number.

It is an amenable number.

6690913 is a deficient number, since it is larger than the sum of its proper divisors (163235).

6690913 is a wasteful number, since it uses less digits than its factorization.

6690913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163234.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 6690913 is about 2586.6799183509. The cubic root of 6690913 is about 188.4350964558.

The spelling of 6690913 in words is "six million, six hundred ninety thousand, nine hundred thirteen".