6391117251 has 6 divisors (see below), whose sum is σ = 9231613820. Its totient is φ = 4260744828.

The previous prime is 6391117247. The next prime is 6391117253. The reversal of 6391117251 is 1527111936.

It is a happy number.

6391117251 is a `hidden beast` number, since 6 + 391 + 1 + 17 + 251 = 666.

It is not a de Polignac number, because 6391117251 - 2² = 6391117247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391117253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355062061 + ... + 355062078.

Almost surely, 2^6391117251 is an apocalyptic number.

6391117251 is a deficient number, since it is larger than the sum of its proper divisors (2840496569).

6391117251 is a wasteful number, since it uses less digits than its factorization.

6391117251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710124145 (or 710124142 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 6391117251 is about 79944.4635418864. The cubic root of 6391117251 is about 1855.7761759847.

The spelling of 6391117251 in words is "six billion, three hundred ninety-one million, one hundred seventeen thousand, two hundred fifty-one".