648547581 has 32 divisors (see below), whose sum is σ = 972505728. Its totient is φ = 380989440.

The previous prime is 648547517. The next prime is 648547607. The reversal of 648547581 is 185745846.

648547581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 648547581 - 2⁶ = 648547517 is a prime.

It is a super-2 number, since 2×648547581² = 841227929641903122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 648547581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648547381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 381325 + ... + 383021.

It is an arithmetic number, because the mean of its divisors is an integer number (30390804).

Almost surely, 2^648547581 is an apocalyptic number.

It is an amenable number.

648547581 is a deficient number, since it is larger than the sum of its proper divisors (323958147).

648547581 is a wasteful number, since it uses less digits than its factorization.

648547581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its digits is 1075200, while the sum is 48.

The square root of 648547581 is about 25466.5973581081. The cubic root of 648547581 is about 865.5934230832.

The spelling of 648547581 in words is "six hundred forty-eight million, five hundred forty-seven thousand, five hundred eighty-one".