1681313 has 4 divisors (see below), whose sum is σ = 1692180. Its totient is φ = 1670448.

The previous prime is 1681307. The next prime is 1681321. The reversal of 1681313 is 3131861.

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 1151329 + 529984 = 1073^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681313 - 2¹² = 1677217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1681363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5198 + ... + 5511.

It is an arithmetic number, because the mean of its divisors is an integer number (423045).

2^1681313 is an apocalyptic number.

It is an amenable number.

1681313 is a deficient number, since it is larger than the sum of its proper divisors (10867).

1681313 is a wasteful number, since it uses less digits than its factorization.

1681313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10866.

The product of its digits is 432, while the sum is 23.

The square root of 1681313 is about 1296.6545415029. The cubic root of 1681313 is about 118.9094007110.

The spelling of 1681313 in words is "one million, six hundred eighty-one thousand, three hundred thirteen".