6477981 has 4 divisors (see below), whose sum is σ = 8637312. Its totient is φ = 4318652.

The previous prime is 6477971. The next prime is 6477983. The reversal of 6477981 is 1897746.

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 6477981 - 2⁵ = 6477949 is a prime.

It is a super-2 number, since 2×6477981² = 83928475672722, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6477983) 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, 1079661 + ... + 1079666.

It is an arithmetic number, because the mean of its divisors is an integer number (2159328).

Almost surely, 2^6477981 is an apocalyptic number.

It is an amenable number.

6477981 is a deficient number, since it is larger than the sum of its proper divisors (2159331).

6477981 is a wasteful number, since it uses less digits than its factorization.

6477981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159330.

The product of its digits is 84672, while the sum is 42.

The square root of 6477981 is about 2545.1878123235. The cubic root of 6477981 is about 186.4145856841.

The spelling of 6477981 in words is "six million, four hundred seventy-seven thousand, nine hundred eighty-one".