648695251 has 2 divisors, whose sum is σ = 648695252. Its totient is φ = 648695250.

The previous prime is 648695239. The next prime is 648695309. The reversal of 648695251 is 152596846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648695251 - 2⁵ = 648695219 is a prime.

It is not a weakly prime, because it can be changed into another prime (648695351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324347625 + 324347626.

It is an arithmetic number, because the mean of its divisors is an integer number (324347626).

Almost surely, 2^648695251 is an apocalyptic number.

648695251 is a deficient number, since it is larger than the sum of its proper divisors (1).

648695251 is an equidigital number, since it uses as much as digits as its factorization.

648695251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 648695251 is about 25469.4964810850. The cubic root of 648695251 is about 865.6591147324.

The spelling of 648695251 in words is "six hundred forty-eight million, six hundred ninety-five thousand, two hundred fifty-one".