648054989 has 2 divisors, whose sum is σ = 648054990. Its totient is φ = 648054988.

The previous prime is 648054947. The next prime is 648054991. The reversal of 648054989 is 989450846.

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., 598634089 + 49420900 = 24467^2 + 7030^2 .

It is a cyclic number.

It is not a de Polignac number, because 648054989 - 2²⁰ = 647006413 is a prime.

It is a Sophie Germain prime.

Together with 648054991, it forms a pair of twin primes.

It is a Chen 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 648054989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648054929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324027494 + 324027495.

It is an arithmetic number, because the mean of its divisors is an integer number (324027495).

Almost surely, 2^648054989 is an apocalyptic number.

It is an amenable number.

648054989 is a deficient number, since it is larger than the sum of its proper divisors (1).

648054989 is an equidigital number, since it uses as much as digits as its factorization.

648054989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 648054989 is about 25456.9241857692. The cubic root of 648054989 is about 865.3742192272.

The spelling of 648054989 in words is "six hundred forty-eight million, fifty-four thousand, nine hundred eighty-nine".