6400451 has 2 divisors, whose sum is σ = 6400452. Its totient is φ = 6400450.

The previous prime is 6400423. The next prime is 6400453. The reversal of 6400451 is 1540046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6400451 - 2¹⁰ = 6399427 is a prime.

Together with 6400453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6400453) 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 as a sum of consecutive naturals, namely, 3200225 + 3200226.

It is an arithmetic number, because the mean of its divisors is an integer number (3200226).

Almost surely, 2^6400451 is an apocalyptic number.

6400451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400451 is an equidigital number, since it uses as much as digits as its factorization.

6400451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 6400451 is about 2529.9112632660. The cubic root of 6400451 is about 185.6679144016.

Adding to 6400451 its reverse (1540046), we get a palindrome (7940497).

It can be divided in two parts, 640045 and 1, that added together give a palindrome (640046).

The spelling of 6400451 in words is "six million, four hundred thousand, four hundred fifty-one".