6821601 has 4 divisors (see below), whose sum is σ = 9095472. Its totient is φ = 4547732.

The previous prime is 6821599. The next prime is 6821611. The reversal of 6821601 is 1061286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6821601 - 2¹ = 6821599 is a prime.

It is a D-number.

6821601 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6821611) 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, 1136931 + ... + 1136936.

It is an arithmetic number, because the mean of its divisors is an integer number (2273868).

Almost surely, 2^6821601 is an apocalyptic number.

It is an amenable number.

6821601 is a deficient number, since it is larger than the sum of its proper divisors (2273871).

6821601 is a wasteful number, since it uses less digits than its factorization.

6821601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273870.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 6821601 is about 2611.8194807452. The cubic root of 6821601 is about 189.6540426603.

Adding to 6821601 its reverse (1061286), we get a palindrome (7882887).

The spelling of 6821601 in words is "six million, eight hundred twenty-one thousand, six hundred one".