1681469 has 2 divisors, whose sum is σ = 1681470. Its totient is φ = 1681468.

The previous prime is 1681423. The next prime is 1681501. The reversal of 1681469 is 9641861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 438244 = 1115^2 + 662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681469 is a prime.

It is a super-2 number, since 2×1681469² = 5654675995922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1683469) 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 as a sum of consecutive naturals, namely, 840734 + 840735.

It is an arithmetic number, because the mean of its divisors is an integer number (840735).

2^1681469 is an apocalyptic number.

It is an amenable number.

1681469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681469 is an equidigital number, since it uses as much as digits as its factorization.

1681469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 1681469 is about 1296.7146949117. The cubic root of 1681469 is about 118.9130782521.

The spelling of 1681469 in words is "one million, six hundred eighty-one thousand, four hundred sixty-nine".