1680911 has 4 divisors (see below), whose sum is σ = 1769400. Its totient is φ = 1592424.

The previous prime is 1680907. The next prime is 1680919. The reversal of 1680911 is 1190861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1190861 = 7 ⋅170123.

It is a cyclic number.

It is not a de Polignac number, because 1680911 - 2² = 1680907 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 (1680919) 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 in 3 ways as a sum of consecutive naturals, for example, 44216 + ... + 44253.

It is an arithmetic number, because the mean of its divisors is an integer number (442350).

2^1680911 is an apocalyptic number.

1680911 is a deficient number, since it is larger than the sum of its proper divisors (88489).

1680911 is an equidigital number, since it uses as much as digits as its factorization.

1680911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88488.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1680911 is about 1296.4995179328. The cubic root of 1680911 is about 118.8999229220.

The spelling of 1680911 in words is "one million, six hundred eighty thousand, nine hundred eleven".