6851621 has 12 divisors (see below), whose sum is σ = 8093088. Its totient is φ = 5782392.

The previous prime is 6851617. The next prime is 6851639. The reversal of 6851621 is 1261586.

It is a happy number.

It is not a de Polignac number, because 6851621 - 2² = 6851617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2240 + ... + 4326.

It is an arithmetic number, because the mean of its divisors is an integer number (674424).

Almost surely, 2^6851621 is an apocalyptic number.

It is an amenable number.

6851621 is a deficient number, since it is larger than the sum of its proper divisors (1241467).

6851621 is a wasteful number, since it uses less digits than its factorization.

6851621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168 (or 2161 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 6851621 is about 2617.5601234738. The cubic root of 6851621 is about 189.9318407412.

The spelling of 6851621 in words is "six million, eight hundred fifty-one thousand, six hundred twenty-one".