648706549 has 4 divisors (see below), whose sum is σ = 662508864. Its totient is φ = 634904236.

The previous prime is 648706523. The next prime is 648706567. The reversal of 648706549 is 945607846.

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 a cyclic number.

It is not a de Polignac number, because 648706549 - 2¹⁹ = 648182261 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 (648706579) 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, 6901087 + ... + 6901180.

It is an arithmetic number, because the mean of its divisors is an integer number (165627216).

Almost surely, 2^648706549 is an apocalyptic number.

It is an amenable number.

648706549 is a deficient number, since it is larger than the sum of its proper divisors (13802315).

648706549 is a wasteful number, since it uses less digits than its factorization.

648706549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13802314.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 648706549 is about 25469.7182748455. The cubic root of 648706549 is about 865.6641402869.

The spelling of 648706549 in words is "six hundred forty-eight million, seven hundred six thousand, five hundred forty-nine".