648021611 has 2 divisors, whose sum is σ = 648021612. Its totient is φ = 648021610.

The previous prime is 648021599. The next prime is 648021637. The reversal of 648021611 is 116120846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648021611 - 2¹⁸ = 647759467 is a prime.

It is not a weakly prime, because it can be changed into another prime (648021641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324010805 + 324010806.

It is an arithmetic number, because the mean of its divisors is an integer number (324010806).

Almost surely, 2^648021611 is an apocalyptic number.

648021611 is a deficient number, since it is larger than the sum of its proper divisors (1).

648021611 is an equidigital number, since it uses as much as digits as its factorization.

648021611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 648021611 is about 25456.2685993058. The cubic root of 648021611 is about 865.3593619712.

The spelling of 648021611 in words is "six hundred forty-eight million, twenty-one thousand, six hundred eleven".