6725909 has 2 divisors, whose sum is σ = 6725910. Its totient is φ = 6725908.

The previous prime is 6725899. The next prime is 6725911. The reversal of 6725909 is 9095276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5522500 + 1203409 = 2350^2 + 1097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6725909 is a prime.

Together with 6725911, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6725969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3362954 + 3362955.

It is an arithmetic number, because the mean of its divisors is an integer number (3362955).

Almost surely, 2^6725909 is an apocalyptic number.

It is an amenable number.

6725909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6725909 is an equidigital number, since it uses as much as digits as its factorization.

6725909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 6725909 is about 2593.4357520479. The cubic root of 6725909 is about 188.7630542263.

The spelling of 6725909 in words is "six million, seven hundred twenty-five thousand, nine hundred nine".