648769049 has 2 divisors, whose sum is σ = 648769050. Its totient is φ = 648769048.

The previous prime is 648769039. The next prime is 648769057. The reversal of 648769049 is 940967846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637209049 + 11560000 = 25243^2 + 3400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648769049 is a prime.

It is not a weakly prime, because it can be changed into another prime (648769019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324384524 + 324384525.

It is an arithmetic number, because the mean of its divisors is an integer number (324384525).

Almost surely, 2^648769049 is an apocalyptic number.

It is an amenable number.

648769049 is a deficient number, since it is larger than the sum of its proper divisors (1).

648769049 is an equidigital number, since it uses as much as digits as its factorization.

648769049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 648769049 is about 25470.9451925130. The cubic root of 648769049 is about 865.6919403614.

The spelling of 648769049 in words is "six hundred forty-eight million, seven hundred sixty-nine thousand, forty-nine".