1681139 has 8 divisors (see below), whose sum is σ = 1847040. Its totient is φ = 1523016.

The previous prime is 1681129. The next prime is 1681151. The reversal of 1681139 is 9311861.

It is a happy number.

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-1681139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681129) 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, 1487 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (230880).

2^1681139 is an apocalyptic number.

1681139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1681139 is a deficient number, since it is larger than the sum of its proper divisors (165901).

1681139 is a wasteful number, since it uses less digits than its factorization.

1681139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889.

The product of its digits is 1296, while the sum is 29.

The square root of 1681139 is about 1296.5874440237. The cubic root of 1681139 is about 118.9052985699.

The spelling of 1681139 in words is "one million, six hundred eighty-one thousand, one hundred thirty-nine".