1688323213 has 4 divisors (see below), whose sum is σ = 1689190528. Its totient is φ = 1687455900.

The previous prime is 1688323201. The next prime is 1688323229. The reversal of 1688323213 is 3123238861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3123238861 = 17 ⋅183719933.

It is a cyclic number.

It is not a de Polignac number, because 1688323213 - 2⁵ = 1688323181 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 (1688323253) 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 3 ways as a sum of consecutive naturals, for example, 430731 + ... + 434632.

It is an arithmetic number, because the mean of its divisors is an integer number (422297632).

Almost surely, 2^1688323213 is an apocalyptic number.

It is an amenable number.

1688323213 is a deficient number, since it is larger than the sum of its proper divisors (867315).

1688323213 is an equidigital number, since it uses as much as digits as its factorization.

1688323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867314.

The product of its digits is 41472, while the sum is 37.

The square root of 1688323213 is about 41089.2104207418. The cubic root of 1688323213 is about 1190.7443529385.

The spelling of 1688323213 in words is "one billion, six hundred eighty-eight million, three hundred twenty-three thousand, two hundred thirteen".