6488991 has 10 divisors (see below), whose sum is σ = 9693552. Its totient is φ = 4325940.

The previous prime is 6488987. The next prime is 6489083. The reversal of 6488991 is 1998846.

It is not a de Polignac number, because 6488991 - 2² = 6488987 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6488941) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39975 + ... + 40136.

Almost surely, 2^6488991 is an apocalyptic number.

6488991 is a deficient number, since it is larger than the sum of its proper divisors (3204561).

6488991 is an equidigital number, since it uses as much as digits as its factorization.

6488991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80123 (or 80114 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 6488991 is about 2547.3497993012. The cubic root of 6488991 is about 186.5201362106.

It can be divided in two parts, 64889 and 91, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 6488991 in words is "six million, four hundred eighty-eight thousand, nine hundred ninety-one".