1681355 has 8 divisors (see below), whose sum is σ = 2172912. Its totient is φ = 1241568.

The previous prime is 1681349. The next prime is 1681363. The reversal of 1681355 is 5531861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681355 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 12869 + ... + 12998.

It is an arithmetic number, because the mean of its divisors is an integer number (271614).

2^1681355 is an apocalyptic number.

1681355 is a deficient number, since it is larger than the sum of its proper divisors (491557).

1681355 is a wasteful number, since it uses less digits than its factorization.

1681355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25885.

The product of its digits is 3600, while the sum is 29.

The square root of 1681355 is about 1296.6707369259. The cubic root of 1681355 is about 118.9103908406.

The spelling of 1681355 in words is "one million, six hundred eighty-one thousand, three hundred fifty-five".