6491006497 has 4 divisors (see below), whose sum is σ = 6518165760. Its totient is φ = 6463847236.

The previous prime is 6491006443. The next prime is 6491006507. The reversal of 6491006497 is 7946001946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7946001946 = 2 ⋅3973000973.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6491006497 is a prime.

It is a super-2 number, since 2×6491006497² = 84266330688192422018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6491006897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13579273 + ... + 13579750.

It is an arithmetic number, because the mean of its divisors is an integer number (1629541440).

Almost surely, 2^6491006497 is an apocalyptic number.

It is an amenable number.

6491006497 is a deficient number, since it is larger than the sum of its proper divisors (27159263).

6491006497 is a wasteful number, since it uses less digits than its factorization.

6491006497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27159262.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 6491006497 is about 80566.7828388350. The cubic root of 6491006497 is about 1865.3944542010.

The spelling of 6491006497 in words is "six billion, four hundred ninety-one million, six thousand, four hundred ninety-seven".