6990617 has 2 divisors, whose sum is σ = 6990618. Its totient is φ = 6990616.

The previous prime is 6990611. The next prime is 6990619. The reversal of 6990617 is 7160996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4999696 + 1990921 = 2236^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990617 - 2¹² = 6986521 is a prime.

Together with 6990619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6990611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495308 + 3495309.

It is an arithmetic number, because the mean of its divisors is an integer number (3495309).

Almost surely, 2^6990617 is an apocalyptic number.

It is an amenable number.

6990617 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990617 is an equidigital number, since it uses as much as digits as its factorization.

6990617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 6990617 is about 2643.9774961221. The cubic root of 6990617 is about 191.2076084722.

The spelling of 6990617 in words is "six million, nine hundred ninety thousand, six hundred seventeen".