1648021 has 2 divisors, whose sum is σ = 1648022. Its totient is φ = 1648020.

The previous prime is 1648001. The next prime is 1648039. The reversal of 1648021 is 1208461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 617796 = 1015^2 + 786^2 .

It is an emirp because it is prime and its reverse (1208461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1648021 - 2¹³ = 1639829 is a prime.

It is a pancake number, because a pancake can be divided into 1648021 parts by 1815 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 1647983 and 1648001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824010 + 824011.

It is an arithmetic number, because the mean of its divisors is an integer number (824011).

2^1648021 is an apocalyptic number.

It is an amenable number.

1648021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648021 is an equidigital number, since it uses as much as digits as its factorization.

1648021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1648021 is about 1283.7527020419. The cubic root of 1648021 is about 118.1193133886.

The spelling of 1648021 in words is "one million, six hundred forty-eight thousand, twenty-one".