6897221 has 8 divisors (see below), whose sum is σ = 7154688. Its totient is φ = 6642000.

The previous prime is 6897211. The next prime is 6897271. The reversal of 6897221 is 1227986.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6897221 - 2¹⁴ = 6880837 is a prime.

It is a d-powerful number, because it can be written as 6² + 8⁷ + 9⁷ + 7⁵ + 2⁷ + 2⁷ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6897211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7991 + ... + 8811.

It is an arithmetic number, because the mean of its divisors is an integer number (894336).

Almost surely, 2^6897221 is an apocalyptic number.

It is an amenable number.

6897221 is a deficient number, since it is larger than the sum of its proper divisors (257467).

6897221 is a wasteful number, since it uses less digits than its factorization.

6897221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123.

The product of its digits is 12096, while the sum is 35.

The square root of 6897221 is about 2626.2560804308. The cubic root of 6897221 is about 190.3522643112.

The spelling of 6897221 in words is "six million, eight hundred ninety-seven thousand, two hundred twenty-one".