648889229 has 4 divisors (see below), whose sum is σ = 661132476. Its totient is φ = 636645984.

The previous prime is 648889217. The next prime is 648889249. The reversal of 648889229 is 922988846.

648889229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 554838025 + 94051204 = 23555^2 + 9698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648889229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648889249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6121544 + ... + 6121649.

It is an arithmetic number, because the mean of its divisors is an integer number (165283119).

Almost surely, 2^648889229 is an apocalyptic number.

It is an amenable number.

648889229 is a deficient number, since it is larger than the sum of its proper divisors (12243247).

648889229 is a wasteful number, since it uses less digits than its factorization.

648889229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12243246.

The product of its digits is 3981312, while the sum is 56.

The square root of 648889229 is about 25473.3042418921. The cubic root of 648889229 is about 865.7453915518.

The spelling of 648889229 in words is "six hundred forty-eight million, eight hundred eighty-nine thousand, two hundred twenty-nine".