648901 has 4 divisors (see below), whose sum is σ = 707904. Its totient is φ = 589900.

The previous prime is 648889. The next prime is 648911. The reversal of 648901 is 109846.

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 a de Polignac number, because none of the positive numbers 2^k-648901 is a prime.

It is a Duffinian number.

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 648901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29485 + ... + 29506.

It is an arithmetic number, because the mean of its divisors is an integer number (176976).

2⁶⁴⁸⁹⁰¹ is an apocalyptic number.

It is an amenable number.

648901 is a deficient number, since it is larger than the sum of its proper divisors (59003).

648901 is a wasteful number, since it uses less digits than its factorization.

648901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59002.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 648901 is about 805.5439156247. The cubic root of 648901 is about 86.5750626460.

The spelling of 648901 in words is "six hundred forty-eight thousand, nine hundred one".