6621079 has 4 divisors (see below), whose sum is σ = 6908976. Its totient is φ = 6333184.

The previous prime is 6621071. The next prime is 6621103. The reversal of 6621079 is 9701266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9701266 = 2 ⋅4850633.

It is a cyclic number.

It is not a de Polignac number, because 6621079 - 2³ = 6621071 is a prime.

It is an Ulam number.

It is a Duffinian number.

6621079 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6621079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621071) 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, 143914 + ... + 143959.

It is an arithmetic number, because the mean of its divisors is an integer number (1727244).

Almost surely, 2^6621079 is an apocalyptic number.

6621079 is a deficient number, since it is larger than the sum of its proper divisors (287897).

6621079 is a wasteful number, since it uses less digits than its factorization.

6621079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287896.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 6621079 is about 2573.1457401399. The cubic root of 6621079 is about 187.7772278291. Note that the first 3 decimals are identical.

The spelling of 6621079 in words is "six million, six hundred twenty-one thousand, seventy-nine".