648403187 has 2 divisors, whose sum is σ = 648403188. Its totient is φ = 648403186.

The previous prime is 648403163. The next prime is 648403237. The reversal of 648403187 is 781304846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648403187 - 2⁶ = 648403123 is a prime.

It is not a weakly prime, because it can be changed into another prime (648403127) 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 as a sum of consecutive naturals, namely, 324201593 + 324201594.

It is an arithmetic number, because the mean of its divisors is an integer number (324201594).

Almost surely, 2^648403187 is an apocalyptic number.

648403187 is a deficient number, since it is larger than the sum of its proper divisors (1).

648403187 is an equidigital number, since it uses as much as digits as its factorization.

648403187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 648403187 is about 25463.7622318463. The cubic root of 648403187 is about 865.5291791340.

The spelling of 648403187 in words is "six hundred forty-eight million, four hundred three thousand, one hundred eighty-seven".