6451691 has 2 divisors, whose sum is σ = 6451692. Its totient is φ = 6451690.

The previous prime is 6451657. The next prime is 6451723. The reversal of 6451691 is 1961546.

It is an a-pointer prime, because the next prime (6451723) can be obtained adding 6451691 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6451691 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6451091) 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 as a sum of consecutive naturals, namely, 3225845 + 3225846.

It is an arithmetic number, because the mean of its divisors is an integer number (3225846).

Almost surely, 2^6451691 is an apocalyptic number.

6451691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6451691 is an equidigital number, since it uses as much as digits as its factorization.

6451691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 6451691 is about 2540.0179133227. The cubic root of 6451691 is about 186.1620644000.

The spelling of 6451691 in words is "six million, four hundred fifty-one thousand, six hundred ninety-one".