6618121 has 4 divisors (see below), whose sum is σ = 6629632. Its totient is φ = 6606612.

The previous prime is 6618113. The next prime is 6618127. The reversal of 6618121 is 1218166.

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 6618121 - 2³ = 6618113 is a prime.

It is a Duffinian number.

6618121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6618127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4845 + ... + 6058.

It is an arithmetic number, because the mean of its divisors is an integer number (1657408).

Almost surely, 2^6618121 is an apocalyptic number.

It is an amenable number.

6618121 is a deficient number, since it is larger than the sum of its proper divisors (11511).

6618121 is a wasteful number, since it uses less digits than its factorization.

6618121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510.

The product of its digits is 576, while the sum is 25.

The square root of 6618121 is about 2572.5708930951. The cubic root of 6618121 is about 187.7492601934.

It can be divided in two parts, 6 and 618121, that multiplied together give a triangular number (3708726 = T₂₇₂₃).

The spelling of 6618121 in words is "six million, six hundred eighteen thousand, one hundred twenty-one".