1681349 has 2 divisors, whose sum is σ = 1681350. Its totient is φ = 1681348.

The previous prime is 1681321. The next prime is 1681363. The reversal of 1681349 is 9431861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 889249 + 792100 = 943^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681349 - 2¹² = 1677253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840674 + 840675.

It is an arithmetic number, because the mean of its divisors is an integer number (840675).

2^1681349 is an apocalyptic number.

It is an amenable number.

1681349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681349 is an equidigital number, since it uses as much as digits as its factorization.

1681349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 1681349 is about 1296.6684233064. The cubic root of 1681349 is about 118.9102493945.

The spelling of 1681349 in words is "one million, six hundred eighty-one thousand, three hundred forty-nine".