648345909 has 4 divisors (see below), whose sum is σ = 864461216. Its totient is φ = 432230604.

The previous prime is 648345889. The next prime is 648345917. The reversal of 648345909 is 909543846.

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 not a de Polignac number, because 648345909 - 2⁵ = 648345877 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 (648345109) 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, 108057649 + ... + 108057654.

It is an arithmetic number, because the mean of its divisors is an integer number (216115304).

Almost surely, 2^648345909 is an apocalyptic number.

It is an amenable number.

648345909 is a deficient number, since it is larger than the sum of its proper divisors (216115307).

648345909 is a wasteful number, since it uses less digits than its factorization.

648345909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216115306.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 648345909 is about 25462.6375106743. The cubic root of 648345909 is about 865.5036922964.

The spelling of 648345909 in words is "six hundred forty-eight million, three hundred forty-five thousand, nine hundred nine".