6818121 has 16 divisors (see below), whose sum is σ = 10254400. Its totient is φ = 4476384.

The previous prime is 6818117. The next prime is 6818137. The reversal of 6818121 is 1218186.

It is not a de Polignac number, because 6818121 - 2² = 6818117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6818191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76 + ... + 3693.

It is an arithmetic number, because the mean of its divisors is an integer number (640900).

Almost surely, 2^6818121 is an apocalyptic number.

It is an amenable number.

6818121 is a deficient number, since it is larger than the sum of its proper divisors (3436279).

6818121 is a wasteful number, since it uses less digits than its factorization.

6818121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3839 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 6818121 is about 2611.1531935143. The cubic root of 6818121 is about 189.6217868731.

The spelling of 6818121 in words is "six million, eight hundred eighteen thousand, one hundred twenty-one".