6621099 has 4 divisors (see below), whose sum is σ = 8828136. Its totient is φ = 4414064.

The previous prime is 6621071. The next prime is 6621103. The reversal of 6621099 is 9901266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6621099 - 2⁹ = 6620587 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6621029) 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, 1103514 + ... + 1103519.

It is an arithmetic number, because the mean of its divisors is an integer number (2207034).

Almost surely, 2^6621099 is an apocalyptic number.

6621099 is a deficient number, since it is larger than the sum of its proper divisors (2207037).

6621099 is a wasteful number, since it uses less digits than its factorization.

6621099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207036.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 6621099 is about 2573.1496264306. The cubic root of 6621099 is about 187.7774168991. Note that the first 3 decimals are identical.

The spelling of 6621099 in words is "six million, six hundred twenty-one thousand, ninety-nine".