6451391 has 4 divisors (see below), whose sum is σ = 6608784. Its totient is φ = 6294000.

The previous prime is 6451387. The next prime is 6451397. The reversal of 6451391 is 1931546.

6451391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1931546 = 2 ⋅965773.

It is a cyclic number.

It is not a de Polignac number, because 6451391 - 2² = 6451387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6451397) 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, 78635 + ... + 78716.

It is an arithmetic number, because the mean of its divisors is an integer number (1652196).

Almost surely, 2^6451391 is an apocalyptic number.

6451391 is a deficient number, since it is larger than the sum of its proper divisors (157393).

6451391 is a wasteful number, since it uses less digits than its factorization.

6451391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157392.

The product of its digits is 3240, while the sum is 29.

The square root of 6451391 is about 2539.9588579345. The cubic root of 6451391 is about 186.1591788782.

The spelling of 6451391 in words is "six million, four hundred fifty-one thousand, three hundred ninety-one".