648412993 has 4 divisors (see below), whose sum is σ = 648514260. Its totient is φ = 648311728.

The previous prime is 648412931. The next prime is 648413011. The reversal of 648412993 is 399214846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399214846 = 2 ⋅199607423.

It can be written as a sum of positive squares in 2 ways, for example, as 87291649 + 561121344 = 9343^2 + 23688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648412993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648412903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40330 + ... + 54067.

It is an arithmetic number, because the mean of its divisors is an integer number (162128565).

Almost surely, 2^648412993 is an apocalyptic number.

It is an amenable number.

648412993 is a deficient number, since it is larger than the sum of its proper divisors (101267).

648412993 is an equidigital number, since it uses as much as digits as its factorization.

648412993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101266.

The product of its digits is 373248, while the sum is 46.

The square root of 648412993 is about 25463.9547792561. The cubic root of 648412993 is about 865.5335423329.

The spelling of 648412993 in words is "six hundred forty-eight million, four hundred twelve thousand, nine hundred ninety-three".