1681633 has 8 divisors (see below), whose sum is σ = 1797920. Its totient is φ = 1568160.

The previous prime is 1681621. The next prime is 1681639. The reversal of 1681633 is 3361861.

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-1681633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1681639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613 + ... + 1933.

It is an arithmetic number, because the mean of its divisors is an integer number (224740).

2^1681633 is an apocalyptic number.

It is an amenable number.

1681633 is a deficient number, since it is larger than the sum of its proper divisors (116287).

1681633 is a wasteful number, since it uses less digits than its factorization.

1681633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407.

The product of its digits is 2592, while the sum is 28.

The square root of 1681633 is about 1296.7779301021. Note that the first 3 decimals coincide. The cubic root of 1681633 is about 118.9169441397.

The spelling of 1681633 in words is "one million, six hundred eighty-one thousand, six hundred thirty-three".