8391641 has 2 divisors, whose sum is σ = 8391642. Its totient is φ = 8391640.

The previous prime is 8391623. The next prime is 8391653. The reversal of 8391641 is 1461938.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8065600 + 326041 = 2840^2 + 571^2 .

It is a cyclic number.

It is not a de Polignac number, because 8391641 - 2⁶ = 8391577 is a prime.

It is equal to p₅₆₄₃₅₉ and since 8391641 and 564359 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 8391598 and 8391607.

It is not a weakly prime, because it can be changed into another prime (8391841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4195820 + 4195821.

It is an arithmetic number, because the mean of its divisors is an integer number (4195821).

Almost surely, 2^8391641 is an apocalyptic number.

It is an amenable number.

8391641 is a deficient number, since it is larger than the sum of its proper divisors (1).

8391641 is an equidigital number, since it uses as much as digits as its factorization.

8391641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 8391641 is about 2896.8329258002. The cubic root of 8391641 is about 203.2118199590.

The spelling of 8391641 in words is "eight million, three hundred ninety-one thousand, six hundred forty-one".