6451881 has 8 divisors (see below), whose sum is σ = 8668704. Its totient is φ = 4268160.

The previous prime is 6451873. The next prime is 6451889. The reversal of 6451881 is 1881546.

It is an interprime number because it is at equal distance from previous prime (6451873) and next prime (6451889).

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

It is not a de Polignac number, because 6451881 - 2³ = 6451873 is a prime.

It is a super-2 number, since 2×6451881² = 83253536876322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6451889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7816 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (1083588).

Almost surely, 2^6451881 is an apocalyptic number.

It is an amenable number.

6451881 is a deficient number, since it is larger than the sum of its proper divisors (2216823).

6451881 is a wasteful number, since it uses less digits than its factorization.

6451881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16551.

The product of its digits is 7680, while the sum is 33.

The square root of 6451881 is about 2540.0553143583. The cubic root of 6451881 is about 186.1638918509.

The spelling of 6451881 in words is "six million, four hundred fifty-one thousand, eight hundred eighty-one".