6547981 has 4 divisors (see below), whose sum is σ = 7143264. Its totient is φ = 5952700.

The previous prime is 6547979. The next prime is 6548023. The reversal of 6547981 is 1897456.

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 6547981 - 2¹ = 6547979 is a prime.

It is a super-2 number, since 2×6547981² = 85752110352722, 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 (6547081) 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, 297625 + ... + 297646.

It is an arithmetic number, because the mean of its divisors is an integer number (1785816).

Almost surely, 2^6547981 is an apocalyptic number.

It is an amenable number.

6547981 is a deficient number, since it is larger than the sum of its proper divisors (595283).

6547981 is a wasteful number, since it uses less digits than its factorization.

6547981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595282.

The product of its digits is 60480, while the sum is 40.

The square root of 6547981 is about 2558.9023037232. The cubic root of 6547981 is about 187.0836366988.

The spelling of 6547981 in words is "six million, five hundred forty-seven thousand, nine hundred eighty-one".