6659121 has 32 divisors (see below), whose sum is σ = 11225088. Its totient is φ = 3421440.

The previous prime is 6659113. The next prime is 6659201. The reversal of 6659121 is 1219566.

6659121 = T₃₆ + T₃₇ + ... + T₃₄₁.

It is not a de Polignac number, because 6659121 - 2³ = 6659113 is a prime.

It is an Ulam number.

6659121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6659111) 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 31 ways as a sum of consecutive naturals, for example, 7806 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (350784).

Almost surely, 2^6659121 is an apocalyptic number.

It is an amenable number.

6659121 is a deficient number, since it is larger than the sum of its proper divisors (4565967).

6659121 is a wasteful number, since it uses less digits than its factorization.

6659121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its digits is 3240, while the sum is 30.

The square root of 6659121 is about 2580.5272717024. The cubic root of 6659121 is about 188.1361715275.

The spelling of 6659121 in words is "six million, six hundred fifty-nine thousand, one hundred twenty-one".