648630251 has 2 divisors, whose sum is σ = 648630252. Its totient is φ = 648630250.

The previous prime is 648630197. The next prime is 648630259. The reversal of 648630251 is 152036846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648630251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648630259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324315125 + 324315126.

It is an arithmetic number, because the mean of its divisors is an integer number (324315126).

Almost surely, 2^648630251 is an apocalyptic number.

648630251 is a deficient number, since it is larger than the sum of its proper divisors (1).

648630251 is an equidigital number, since it uses as much as digits as its factorization.

648630251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 648630251 is about 25468.2204128989. The cubic root of 648630251 is about 865.6302004249.

The spelling of 648630251 in words is "six hundred forty-eight million, six hundred thirty thousand, two hundred fifty-one".