6391697 has 4 divisors (see below), whose sum is σ = 6883380. Its totient is φ = 5900016.

The previous prime is 6391669. The next prime is 6391699. The reversal of 6391697 is 7961936.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2027776 + 4363921 = 1424^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391697 - 2¹⁸ = 6129553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391699) 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, 245822 + ... + 245847.

It is an arithmetic number, because the mean of its divisors is an integer number (1720845).

Almost surely, 2^6391697 is an apocalyptic number.

It is an amenable number.

6391697 is a deficient number, since it is larger than the sum of its proper divisors (491683).

6391697 is a wasteful number, since it uses less digits than its factorization.

6391697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491682.

The product of its digits is 61236, while the sum is 41.

The square root of 6391697 is about 2528.1805710827. The cubic root of 6391697 is about 185.5832287815.

The spelling of 6391697 in words is "six million, three hundred ninety-one thousand, six hundred ninety-seven".