648656129 has 4 divisors (see below), whose sum is σ = 707624880. Its totient is φ = 589687380.

The previous prime is 648656101. The next prime is 648656147. The reversal of 648656129 is 921656846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648656129 - 2²⁰ = 647607553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648652129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29484359 + ... + 29484380.

It is an arithmetic number, because the mean of its divisors is an integer number (176906220).

Almost surely, 2^648656129 is an apocalyptic number.

It is an amenable number.

648656129 is a deficient number, since it is larger than the sum of its proper divisors (58968751).

648656129 is a wasteful number, since it uses less digits than its factorization.

648656129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58968750.

The product of its digits is 622080, while the sum is 47.

The square root of 648656129 is about 25468.7284527516. The cubic root of 648656129 is about 865.6417121094.

The spelling of 648656129 in words is "six hundred forty-eight million, six hundred fifty-six thousand, one hundred twenty-nine".