648793889 has 2 divisors, whose sum is σ = 648793890. Its totient is φ = 648793888.

The previous prime is 648793711. The next prime is 648793939. The reversal of 648793889 is 988397846.

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., 556960000 + 91833889 = 23600^2 + 9583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648793889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648790889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324396944 + 324396945.

It is an arithmetic number, because the mean of its divisors is an integer number (324396945).

Almost surely, 2^648793889 is an apocalyptic number.

It is an amenable number.

648793889 is a deficient number, since it is larger than the sum of its proper divisors (1).

648793889 is an equidigital number, since it uses as much as digits as its factorization.

648793889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 62.

The square root of 648793889 is about 25471.4328022591. The cubic root of 648793889 is about 865.7029887273.

The spelling of 648793889 in words is "six hundred forty-eight million, seven hundred ninety-three thousand, eight hundred eighty-nine".