6497521191 has 20 divisors (see below), whose sum is σ = 11092770832. Its totient is φ = 3712868928.

The previous prime is 6497521189. The next prime is 6497521213. The reversal of 6497521191 is 1911257946.

It is not a de Polignac number, because 6497521191 - 2¹ = 6497521189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6497521391) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5729170 + ... + 5730303.

Almost surely, 2^6497521191 is an apocalyptic number.

6497521191 is a deficient number, since it is larger than the sum of its proper divisors (4595249641).

6497521191 is a wasteful number, since it uses less digits than its factorization.

6497521191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459492 (or 11459483 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 6497521191 is about 80607.2030962494. The cubic root of 6497521191 is about 1866.0183128030.

The spelling of 6497521191 in words is "six billion, four hundred ninety-seven million, five hundred twenty-one thousand, one hundred ninety-one".