1648981 has 4 divisors (see below), whose sum is σ = 1655212. Its totient is φ = 1642752.

The previous prime is 1648963. The next prime is 1648987. The reversal of 1648981 is 1898461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108900 + 1540081 = 330^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648981 - 2¹¹ = 1646933 is a prime.

It is a super-2 number, since 2×1648981² = 5438276676722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1648981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2700 + ... + 3253.

It is an arithmetic number, because the mean of its divisors is an integer number (413803).

2^1648981 is an apocalyptic number.

It is an amenable number.

1648981 is a deficient number, since it is larger than the sum of its proper divisors (6231).

1648981 is an equidigital number, since it uses as much as digits as its factorization.

1648981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6230.

The product of its digits is 13824, while the sum is 37.

The square root of 1648981 is about 1284.1265513959. The cubic root of 1648981 is about 118.1422444334.

The spelling of 1648981 in words is "one million, six hundred forty-eight thousand, nine hundred eighty-one".