648947189 has 16 divisors (see below), whose sum is σ = 729824256. Its totient is φ = 571954800.

The previous prime is 648947183. The next prime is 648947191. The reversal of 648947189 is 981749846.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648947189 is a prime.

It is a super-2 number, since 2×648947189² = 842264908222003442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648947183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49454 + ... + 61184.

It is an arithmetic number, because the mean of its divisors is an integer number (45614016).

Almost surely, 2^648947189 is an apocalyptic number.

It is an amenable number.

648947189 is a deficient number, since it is larger than the sum of its proper divisors (80877067).

648947189 is a wasteful number, since it uses less digits than its factorization.

648947189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11896.

The product of its digits is 3483648, while the sum is 56.

The square root of 648947189 is about 25474.4418780864. The cubic root of 648947189 is about 865.7711674505.

The spelling of 648947189 in words is "six hundred forty-eight million, nine hundred forty-seven thousand, one hundred eighty-nine".