6523681 has 2 divisors, whose sum is σ = 6523682. Its totient is φ = 6523680.

The previous prime is 6523663. The next prime is 6523703. The reversal of 6523681 is 1863256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 46656 = 2545^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 6523681 - 2¹⁹ = 5999393 is a prime.

It is a super-2 number, since 2×6523681² = 85116827579522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6523661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3261840 + 3261841.

It is an arithmetic number, because the mean of its divisors is an integer number (3261841).

Almost surely, 2^6523681 is an apocalyptic number.

It is an amenable number.

6523681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6523681 is an equidigital number, since it uses as much as digits as its factorization.

6523681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 6523681 is about 2554.1497606836. The cubic root of 6523681 is about 186.8519231542.

The spelling of 6523681 in words is "six million, five hundred twenty-three thousand, six hundred eighty-one".