648517597 has 18 divisors (see below), whose sum is σ = 813234618. Its totient is φ = 512604288.

The previous prime is 648517577. The next prime is 648517601. The reversal of 648517597 is 795715846.

It can be written as a sum of positive squares in 3 ways, for example, as 441 + 648517156 = 21^2 + 25466^2 .

It is not a de Polignac number, because 648517597 - 2⁷ = 648517469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648517577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 642229 + ... + 643237.

It is an arithmetic number, because the mean of its divisors is an integer number (45179701).

Almost surely, 2^648517597 is an apocalyptic number.

It is an amenable number.

648517597 is a deficient number, since it is larger than the sum of its proper divisors (164717021).

648517597 is an equidigital number, since it uses as much as digits as its factorization.

648517597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 1029 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 52.

The square root of 648517597 is about 25466.0086586022. The cubic root of 648517597 is about 865.5800833510.

Multiplying 648517597 by its sum of digits (52), we get a square (33722915044 = 183638²).

The spelling of 648517597 in words is "six hundred forty-eight million, five hundred seventeen thousand, five hundred ninety-seven".