648236551 has 2 divisors, whose sum is σ = 648236552. Its totient is φ = 648236550.

The previous prime is 648236543. The next prime is 648236581. The reversal of 648236551 is 155632846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648236551 - 2³ = 648236543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648236581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324118275 + 324118276.

It is an arithmetic number, because the mean of its divisors is an integer number (324118276).

Almost surely, 2^648236551 is an apocalyptic number.

648236551 is a deficient number, since it is larger than the sum of its proper divisors (1).

648236551 is an equidigital number, since it uses as much as digits as its factorization.

648236551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 40.

The square root of 648236551 is about 25460.4899992125. The cubic root of 648236551 is about 865.4550273920.

The spelling of 648236551 in words is "six hundred forty-eight million, two hundred thirty-six thousand, five hundred fifty-one".