1683521923 has 4 divisors (see below), whose sum is σ = 1772128360. Its totient is φ = 1594915488.

The previous prime is 1683521911. The next prime is 1683521927. The reversal of 1683521923 is 3291253861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3291253861 = 7 ⋅470179123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1683521923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1683521927) 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, 44303190 + ... + 44303227.

It is an arithmetic number, because the mean of its divisors is an integer number (443032090).

Almost surely, 2^1683521923 is an apocalyptic number.

1683521923 is a deficient number, since it is larger than the sum of its proper divisors (88606437).

1683521923 is an equidigital number, since it uses as much as digits as its factorization.

1683521923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88606436.

The product of its digits is 77760, while the sum is 40.

The square root of 1683521923 is about 41030.7436320620. The cubic root of 1683521923 is about 1189.6145264203.

The spelling of 1683521923 in words is "one billion, six hundred eighty-three million, five hundred twenty-one thousand, nine hundred twenty-three".