6506813 has 2 divisors, whose sum is σ = 6506814. Its totient is φ = 6506812.

The previous prime is 6506789. The next prime is 6506881. The reversal of 6506813 is 3186056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5654884 + 851929 = 2378^2 + 923^2 .

It is a cyclic number.

It is not a de Polignac number, because 6506813 - 2⁸ = 6506557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6506893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253406 + 3253407.

It is an arithmetic number, because the mean of its divisors is an integer number (3253407).

Almost surely, 2^6506813 is an apocalyptic number.

It is an amenable number.

6506813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506813 is an equidigital number, since it uses as much as digits as its factorization.

6506813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 6506813 is about 2550.8455460886. The cubic root of 6506813 is about 186.6907391716.

It can be divided in two parts, 6506 and 813, that multiplied together give a triangular number (5289378 = T₃₂₅₂).

The spelling of 6506813 in words is "six million, five hundred six thousand, eight hundred thirteen".