6990217 has 4 divisors (see below), whose sum is σ = 7527940. Its totient is φ = 6452496.

The previous prime is 6990199. The next prime is 6990227. The reversal of 6990217 is 7120996.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287296 + 6702921 = 536^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990217 - 2¹¹ = 6988169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6990227) 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 in 3 ways as a sum of consecutive naturals, for example, 268842 + ... + 268867.

It is an arithmetic number, because the mean of its divisors is an integer number (1881985).

Almost surely, 2^6990217 is an apocalyptic number.

It is an amenable number.

6990217 is a deficient number, since it is larger than the sum of its proper divisors (537723).

6990217 is a wasteful number, since it uses less digits than its factorization.

6990217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537722.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 6990217 is about 2643.9018514309. The cubic root of 6990217 is about 191.2039614645.

The spelling of 6990217 in words is "six million, nine hundred ninety thousand, two hundred seventeen".