648091 has 8 divisors (see below), whose sum is σ = 697680. Its totient is φ = 599808.

The previous prime is 648079. The next prime is 648097. The reversal of 648091 is 190846.

648091 is a nontrivial binomial coefficient, being equal to C(1139, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648091 - 2⁵ = 648059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (87210).

2⁶⁴⁸⁰⁹¹ is an apocalyptic number.

648091 is the 1138-th triangular number.

648091 is the 380-th centered nonagonal number.

648091 is a deficient number, since it is larger than the sum of its proper divisors (49589).

648091 is a wasteful number, since it uses less digits than its factorization.

648091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

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

The square root of 648091 is about 805.0409927451. The cubic root of 648091 is about 86.5390247915.

The spelling of 648091 in words is "six hundred forty-eight thousand, ninety-one".