6541871489 has 2 divisors, whose sum is σ = 6541871490. Its totient is φ = 6541871488.

The previous prime is 6541871467. The next prime is 6541871509. The reversal of 6541871489 is 9841781456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3384330625 + 3157540864 = 58175^2 + 56192^2 .

It is a cyclic number.

It is not a de Polignac number, because 6541871489 - 2⁸ = 6541871233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6541871489.

It is not a weakly prime, because it can be changed into another prime (6541871429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270935744 + 3270935745.

It is an arithmetic number, because the mean of its divisors is an integer number (3270935745).

Almost surely, 2^6541871489 is an apocalyptic number.

It is an amenable number.

6541871489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541871489 is an equidigital number, since it uses as much as digits as its factorization.

6541871489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The square root of 6541871489 is about 80881.8365827582. The cubic root of 6541871489 is about 1870.2543325136.

The spelling of 6541871489 in words is "six billion, five hundred forty-one million, eight hundred seventy-one thousand, four hundred eighty-nine".