648537907 has 2 divisors, whose sum is σ = 648537908. Its totient is φ = 648537906.

The previous prime is 648537889. The next prime is 648537917. The reversal of 648537907 is 709735846.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648537907 - 2⁷ = 648537779 is a prime.

It is not a weakly prime, because it can be changed into another prime (648537917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324268953 + 324268954.

It is an arithmetic number, because the mean of its divisors is an integer number (324268954).

Almost surely, 2^648537907 is an apocalyptic number.

648537907 is a deficient number, since it is larger than the sum of its proper divisors (1).

648537907 is an equidigital number, since it uses as much as digits as its factorization.

648537907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 648537907 is about 25466.4074223279. The cubic root of 648537907 is about 865.5891192137.

The spelling of 648537907 in words is "six hundred forty-eight million, five hundred thirty-seven thousand, nine hundred seven".