6523813 has 2 divisors, whose sum is σ = 6523814. Its totient is φ = 6523812.

The previous prime is 6523799. The next prime is 6523819. The reversal of 6523813 is 3183256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6441444 + 82369 = 2538^2 + 287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6523813 is a prime.

It is an Ulam number.

6523813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6523819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3261906 + 3261907.

It is an arithmetic number, because the mean of its divisors is an integer number (3261907).

Almost surely, 2^6523813 is an apocalyptic number.

It is an amenable number.

6523813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6523813 is an equidigital number, since it uses as much as digits as its factorization.

6523813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 6523813 is about 2554.1756008544. The cubic root of 6523813 is about 186.8531833981.

It can be divided in two parts, 652 and 3813, that added together give a triangular number (4465 = T₉₄).

The spelling of 6523813 in words is "six million, five hundred twenty-three thousand, eight hundred thirteen".