6657971 has 4 divisors (see below), whose sum is σ = 6947472. Its totient is φ = 6368472.

The previous prime is 6657953. The next prime is 6657979. The reversal of 6657971 is 1797566.

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 6657971 - 2¹⁴ = 6641587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6657979) 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, 144716 + ... + 144761.

It is an arithmetic number, because the mean of its divisors is an integer number (1736868).

Almost surely, 2^6657971 is an apocalyptic number.

6657971 is a deficient number, since it is larger than the sum of its proper divisors (289501).

6657971 is a wasteful number, since it uses less digits than its factorization.

6657971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289500.

The product of its digits is 79380, while the sum is 41.

The square root of 6657971 is about 2580.3044394025. The cubic root of 6657971 is about 188.1253408161.

The spelling of 6657971 in words is "six million, six hundred fifty-seven thousand, nine hundred seventy-one".