6997571 has 4 divisors (see below), whose sum is σ = 7997232. Its totient is φ = 5997912.

The previous prime is 6997559. The next prime is 6997579. The reversal of 6997571 is 1757996.

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

It is a cyclic number.

It is not a de Polignac number, because 6997571 - 2¹⁸ = 6735427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6997579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499820 + ... + 499833.

It is an arithmetic number, because the mean of its divisors is an integer number (1999308).

Almost surely, 2^6997571 is an apocalyptic number.

6997571 is a deficient number, since it is larger than the sum of its proper divisors (999661).

6997571 is an equidigital number, since it uses as much as digits as its factorization.

6997571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999660.

The product of its digits is 119070, while the sum is 44.

The square root of 6997571 is about 2645.2922333837. The cubic root of 6997571 is about 191.2709894801.

The spelling of 6997571 in words is "six million, nine hundred ninety-seven thousand, five hundred seventy-one".