648567013 has 2 divisors, whose sum is σ = 648567014. Its totient is φ = 648567012.

The previous prime is 648566993. The next prime is 648567047. The reversal of 648567013 is 310765846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644042884 + 4524129 = 25378^2 + 2127^2 .

It is a cyclic number.

It is not a de Polignac number, because 648567013 - 2¹³ = 648558821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648565013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324283506 + 324283507.

It is an arithmetic number, because the mean of its divisors is an integer number (324283507).

Almost surely, 2^648567013 is an apocalyptic number.

It is an amenable number.

648567013 is a deficient number, since it is larger than the sum of its proper divisors (1).

648567013 is an equidigital number, since it uses as much as digits as its factorization.

648567013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 648567013 is about 25466.9788746133. The cubic root of 648567013 is about 865.6020680636.

The spelling of 648567013 in words is "six hundred forty-eight million, five hundred sixty-seven thousand, thirteen".