648512461 has 2 divisors, whose sum is σ = 648512462. Its totient is φ = 648512460.

The previous prime is 648512407. The next prime is 648512479. The reversal of 648512461 is 164215846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600985225 + 47527236 = 24515^2 + 6894^2 .

It is a cyclic number.

It is not a de Polignac number, because 648512461 - 2¹⁷ = 648381389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648512461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648512261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324256230 + 324256231.

It is an arithmetic number, because the mean of its divisors is an integer number (324256231).

Almost surely, 2^648512461 is an apocalyptic number.

It is an amenable number.

648512461 is a deficient number, since it is larger than the sum of its proper divisors (1).

648512461 is an equidigital number, since it uses as much as digits as its factorization.

648512461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 648512461 is about 25465.9078181007. The cubic root of 648512461 is about 865.5777983289.

The spelling of 648512461 in words is "six hundred forty-eight million, five hundred twelve thousand, four hundred sixty-one".