6989657 has 2 divisors, whose sum is σ = 6989658. Its totient is φ = 6989656.

The previous prime is 6989651. The next prime is 6989659. The reversal of 6989657 is 7569896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 583696 = 2531^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989657 - 2¹⁴ = 6973273 is a prime.

Together with 6989659, 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 (6989651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494828 + 3494829.

It is an arithmetic number, because the mean of its divisors is an integer number (3494829).

Almost surely, 2^6989657 is an apocalyptic number.

It is an amenable number.

6989657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989657 is an equidigital number, since it uses as much as digits as its factorization.

6989657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 6989657 is about 2643.7959452272. The cubic root of 6989657 is about 191.1988554199.

The spelling of 6989657 in words is "six million, nine hundred eighty-nine thousand, six hundred fifty-seven".