1648081 has 2 divisors, whose sum is σ = 1648082. Its totient is φ = 1648080.

The previous prime is 1648069. The next prime is 1648181. The reversal of 1648081 is 1808461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 147456 = 1225^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648081 - 2⁷ = 1647953 is a prime.

It is a super-2 number, since 2×1648081² = 5432341965122, which contains 22 as substring.

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, 824040 + 824041.

It is an arithmetic number, because the mean of its divisors is an integer number (824041).

2^1648081 is an apocalyptic number.

It is an amenable number.

1648081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648081 is an equidigital number, since it uses as much as digits as its factorization.

1648081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1648081 is about 1283.7760708161. The cubic root of 1648081 is about 118.1207468398.

It can be divided in two parts, 16480 and 81, that added together give a palindrome (16561).

The spelling of 1648081 in words is "one million, six hundred forty-eight thousand, eighty-one".