6658981 has 4 divisors (see below), whose sum is σ = 7610272. Its totient is φ = 5707692.

The previous prime is 6658969. The next prime is 6658997. The reversal of 6658981 is 1898566.

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 a cyclic number.

It is not a de Polignac number, because 6658981 - 2⁹ = 6658469 is a prime.

It is a super-2 number, since 2×6658981² = 88684055916722, which contains 22 as substring.

It is the 2581-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6658921) by changing a digit.

It is a nontrivial repunit in base 2580.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475635 + ... + 475648.

It is an arithmetic number, because the mean of its divisors is an integer number (1902568).

Almost surely, 2^6658981 is an apocalyptic number.

It is an amenable number.

6658981 is a deficient number, since it is larger than the sum of its proper divisors (951291).

6658981 is an equidigital number, since it uses as much as digits as its factorization.

6658981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951290.

The product of its digits is 103680, while the sum is 43.

The square root of 6658981 is about 2580.5001453207. The cubic root of 6658981 is about 188.1348530727.

The spelling of 6658981 in words is "six million, six hundred fifty-eight thousand, nine hundred eighty-one".