6555981 has 8 divisors (see below), whose sum is σ = 8783584. Its totient is φ = 4349520.

The previous prime is 6555971. The next prime is 6556003. The reversal of 6555981 is 1895556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6555981 - 2⁶ = 6555917 is a prime.

It is a super-2 number, since 2×6555981² = 85961773744722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4546 + ... + 5811.

It is an arithmetic number, because the mean of its divisors is an integer number (1097948).

Almost surely, 2^6555981 is an apocalyptic number.

It is an amenable number.

6555981 is a deficient number, since it is larger than the sum of its proper divisors (2227603).

6555981 is a wasteful number, since it uses less digits than its factorization.

6555981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10571.

The product of its digits is 54000, while the sum is 39.

The square root of 6555981 is about 2560.4649968316. The cubic root of 6555981 is about 187.1597955427.

The spelling of 6555981 in words is "six million, five hundred fifty-five thousand, nine hundred eighty-one".