6489752491 has 2 divisors, whose sum is σ = 6489752492. Its totient is φ = 6489752490.

The previous prime is 6489752453. The next prime is 6489752539. The reversal of 6489752491 is 1942579846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6489752491 - 2¹⁹ = 6489228203 is a prime.

It is not a weakly prime, because it can be changed into another prime (6489752441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3244876245 + 3244876246.

It is an arithmetic number, because the mean of its divisors is an integer number (3244876246).

Almost surely, 2^6489752491 is an apocalyptic number.

6489752491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6489752491 is an equidigital number, since it uses as much as digits as its factorization.

6489752491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The square root of 6489752491 is about 80559.0000620663. Note that the first 4 decimals coincide. The cubic root of 6489752491 is about 1865.2743204696.

The spelling of 6489752491 in words is "six billion, four hundred eighty-nine million, seven hundred fifty-two thousand, four hundred ninety-one".