6619881 has 4 divisors (see below), whose sum is σ = 8826512. Its totient is φ = 4413252.

The previous prime is 6619871. The next prime is 6619889. The reversal of 6619881 is 1889166.

6619881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 6619881 - 2⁵ = 6619849 is a prime.

It is a super-2 number, since 2×6619881² = 87645648908322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6619889) 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, 1103311 + ... + 1103316.

It is an arithmetic number, because the mean of its divisors is an integer number (2206628).

Almost surely, 2^6619881 is an apocalyptic number.

It is an amenable number.

6619881 is a deficient number, since it is larger than the sum of its proper divisors (2206631).

6619881 is a wasteful number, since it uses less digits than its factorization.

6619881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206630.

The product of its digits is 20736, while the sum is 39.

The square root of 6619881 is about 2572.9129406181. The cubic root of 6619881 is about 187.7659018460.

The spelling of 6619881 in words is "six million, six hundred nineteen thousand, eight hundred eighty-one".