1681963 has 4 divisors (see below), whose sum is σ = 1780920. Its totient is φ = 1583008.

The previous prime is 1681957. The next prime is 1681973. The reversal of 1681963 is 3691861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3691861 = 1109 ⋅3329.

It is a cyclic number.

It is not a de Polignac number, because 1681963 - 2⁵ = 1681931 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1681903) 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, 49453 + ... + 49486.

It is an arithmetic number, because the mean of its divisors is an integer number (445230).

2^1681963 is an apocalyptic number.

1681963 is a deficient number, since it is larger than the sum of its proper divisors (98957).

1681963 is an equidigital number, since it uses as much as digits as its factorization.

1681963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98956.

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

The square root of 1681963 is about 1296.9051622998. The cubic root of 1681963 is about 118.9247222984.

The spelling of 1681963 in words is "one million, six hundred eighty-one thousand, nine hundred sixty-three".