2648391421 has 16 divisors (see below), whose sum is σ = 2882553520. Its totient is φ = 2418647040.

The previous prime is 2648391413. The next prime is 2648391443. The reversal of 2648391421 is 1241938462.

2648391421 = 36389² + 36390².

It can be written as a sum of positive squares in 8 ways, for example, as 107122500 + 2541268921 = 10350^2 + 50411^2 .

It is a 10-Lehmer number, since φ(2648391421) divides (2648391421-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 2648391421 - 2³ = 2648391413 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 (2648391451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1632991 + ... + 1634611.

It is an arithmetic number, because the mean of its divisors is an integer number (180159595).

Almost surely, 2^2648391421 is an apocalyptic number.

2648391421 is the 36390-th centered square number.

It is an amenable number.

2648391421 is a deficient number, since it is larger than the sum of its proper divisors (234162099).

2648391421 is a wasteful number, since it uses less digits than its factorization.

2648391421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896.

The product of its digits is 82944, while the sum is 40.

The square root of 2648391421 is about 51462.5244328336. The cubic root of 2648391421 is about 1383.5474474916.

The spelling of 2648391421 in words is "two billion, six hundred forty-eight million, three hundred ninety-one thousand, four hundred twenty-one".