1681369 has 8 divisors (see below), whose sum is σ = 1798272. Its totient is φ = 1568160.

The previous prime is 1681363. The next prime is 1681397. The reversal of 1681369 is 9631861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681369 - 2⁷ = 1681241 is a prime.

It is a super-2 number, since 2×1681369² = 5654003428322, which contains 22 as substring.

It is a Duffinian 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52 + ... + 1834.

It is an arithmetic number, because the mean of its divisors is an integer number (224784).

2^1681369 is an apocalyptic number.

It is an amenable number.

1681369 is a deficient number, since it is larger than the sum of its proper divisors (116903).

1681369 is a wasteful number, since it uses less digits than its factorization.

1681369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its digits is 7776, while the sum is 34.

The square root of 1681369 is about 1296.6761353553. The cubic root of 1681369 is about 118.9107208801.

The spelling of 1681369 in words is "one million, six hundred eighty-one thousand, three hundred sixty-nine".