648719497 has 2 divisors, whose sum is σ = 648719498. Its totient is φ = 648719496.

The previous prime is 648719471. The next prime is 648719549. The reversal of 648719497 is 794917846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648262521 + 456976 = 25461^2 + 676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648719497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648719437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324359748 + 324359749.

It is an arithmetic number, because the mean of its divisors is an integer number (324359749).

Almost surely, 2^648719497 is an apocalyptic number.

It is an amenable number.

648719497 is a deficient number, since it is larger than the sum of its proper divisors (1).

648719497 is an equidigital number, since it uses as much as digits as its factorization.

648719497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 648719497 is about 25469.9724577786. The cubic root of 648719497 is about 865.6698997194.

The spelling of 648719497 in words is "six hundred forty-eight million, seven hundred nineteen thousand, four hundred ninety-seven".