648960569 has 2 divisors, whose sum is σ = 648960570. Its totient is φ = 648960568.

The previous prime is 648960553. The next prime is 648960577. The reversal of 648960569 is 965069846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614444944 + 34515625 = 24788^2 + 5875^2 .

It is a cyclic number.

It is not a de Polignac number, because 648960569 - 2⁴ = 648960553 is a prime.

It is a super-2 number, since 2×648960569² = 842299640233607522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 648960569.

It is not a weakly prime, because it can be changed into another prime (648960269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324480284 + 324480285.

It is an arithmetic number, because the mean of its divisors is an integer number (324480285).

Almost surely, 2^648960569 is an apocalyptic number.

It is an amenable number.

648960569 is a deficient number, since it is larger than the sum of its proper divisors (1).

648960569 is an equidigital number, since it uses as much as digits as its factorization.

648960569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The square root of 648960569 is about 25474.7044928886. The cubic root of 648960569 is about 865.7771175693. Note that the first 3 decimals are identical.

The spelling of 648960569 in words is "six hundred forty-eight million, nine hundred sixty thousand, five hundred sixty-nine".