648415879 has 2 divisors, whose sum is σ = 648415880. Its totient is φ = 648415878.

The previous prime is 648415783. The next prime is 648415897. The reversal of 648415879 is 978514846.

Together with next prime (648415897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648415879 - 2²¹ = 646318727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648415279) 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, 324207939 + 324207940.

It is an arithmetic number, because the mean of its divisors is an integer number (324207940).

Almost surely, 2^648415879 is an apocalyptic number.

648415879 is a deficient number, since it is larger than the sum of its proper divisors (1).

648415879 is an equidigital number, since it uses as much as digits as its factorization.

648415879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 648415879 is about 25464.0114475312. The cubic root of 648415879 is about 865.5348264559.

The spelling of 648415879 in words is "six hundred forty-eight million, four hundred fifteen thousand, eight hundred seventy-nine".