648447911 has 4 divisors (see below), whose sum is σ = 648508800. Its totient is φ = 648387024.

The previous prime is 648447893. The next prime is 648447929. The reversal of 648447911 is 119744846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (648447893) and next prime (648447929).

It is a cyclic number.

It is not a de Polignac number, because 648447911 - 2²⁶ = 581339047 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 (648447931) 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, 9806 + ... + 37323.

It is an arithmetic number, because the mean of its divisors is an integer number (162127200).

Almost surely, 2^648447911 is an apocalyptic number.

648447911 is a deficient number, since it is larger than the sum of its proper divisors (60889).

648447911 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (648447910) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (60888).

648447911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60888.

The product of its digits is 193536, while the sum is 44.

The square root of 648447911 is about 25464.6404058648. The cubic root of 648447911 is about 865.5490788084.

The spelling of 648447911 in words is "six hundred forty-eight million, four hundred forty-seven thousand, nine hundred eleven".