6416881 has 4 divisors (see below), whose sum is σ = 6449652. Its totient is φ = 6384112.

The previous prime is 6416867. The next prime is 6416887. The reversal of 6416881 is 1886146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1886146 = 2 ⋅943073.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 3389281 = 1740^2 + 1841^2 .

It is a cyclic number.

It is not a de Polignac number, because 6416881 - 2⁹ = 6416369 is a prime.

It is a super-2 number, since 2×6416881² = 82352723536322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

6416881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6416887) by changing a digit.

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, 16090 + ... + 16483.

It is an arithmetic number, because the mean of its divisors is an integer number (1612413).

Almost surely, 2^6416881 is an apocalyptic number.

It is an amenable number.

6416881 is a deficient number, since it is larger than the sum of its proper divisors (32771).

6416881 is a wasteful number, since it uses less digits than its factorization.

6416881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32770.

The product of its digits is 9216, while the sum is 34.

The square root of 6416881 is about 2533.1563315358. The cubic root of 6416881 is about 185.8266489091.

The spelling of 6416881 in words is "six million, four hundred sixteen thousand, eight hundred eighty-one".