1681247 has 2 divisors, whose sum is σ = 1681248. Its totient is φ = 1681246.

The previous prime is 1681241. The next prime is 1681259. The reversal of 1681247 is 7421861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681247 - 2¹⁴ = 1664863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840623 + 840624.

It is an arithmetic number, because the mean of its divisors is an integer number (840624).

2^1681247 is an apocalyptic number.

1681247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681247 is an equidigital number, since it uses as much as digits as its factorization.

1681247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 1681247 is about 1296.6290911436. The cubic root of 1681247 is about 118.9078447598.

The spelling of 1681247 in words is "one million, six hundred eighty-one thousand, two hundred forty-seven".