6601813 has 2 divisors, whose sum is σ = 6601814. Its totient is φ = 6601812.

The previous prime is 6601811. The next prime is 6601817. The reversal of 6601813 is 3181066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3755844 + 2845969 = 1938^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601813 - 2¹ = 6601811 is a prime.

Together with 6601811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300906 + 3300907.

It is an arithmetic number, because the mean of its divisors is an integer number (3300907).

Almost surely, 2^6601813 is an apocalyptic number.

It is an amenable number.

6601813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601813 is an equidigital number, since it uses as much as digits as its factorization.

6601813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 6601813 is about 2569.3993461508. The cubic root of 6601813 is about 187.5949196437.

Adding to 6601813 its reverse (3181066), we get a palindrome (9782879).

The spelling of 6601813 in words is "six million, six hundred one thousand, eight hundred thirteen".