648515897 has 4 divisors (see below), whose sum is σ = 660752100. Its totient is φ = 636279696.

The previous prime is 648515891. The next prime is 648515953. The reversal of 648515897 is 798515846.

648515897 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 480968761 + 167547136 = 21931^2 + 12944^2 .

It is a cyclic number.

It is not a de Polignac number, because 648515897 - 2²⁶ = 581407033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 12236149 = 648515897 / (6 + 4 + 8 + 5 + 1 + 5 + 8 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648515891) 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, 6118022 + ... + 6118127.

It is an arithmetic number, because the mean of its divisors is an integer number (165188025).

Almost surely, 2^648515897 is an apocalyptic number.

It is an amenable number.

648515897 is a deficient number, since it is larger than the sum of its proper divisors (12236203).

648515897 is a wasteful number, since it uses less digits than its factorization.

648515897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12236202.

The product of its digits is 2419200, while the sum is 53.

The square root of 648515897 is about 25465.9752807545. The cubic root of 648515897 is about 865.5793270171.

The spelling of 648515897 in words is "six hundred forty-eight million, five hundred fifteen thousand, eight hundred ninety-seven".