683394521 has 4 divisors (see below), whose sum is σ = 685916544. Its totient is φ = 680872500.

The previous prime is 683394511. The next prime is 683394533. The reversal of 683394521 is 125493386.

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: 125493386 = 2 ⋅62746693.

It is a cyclic number.

It is not a de Polignac number, because 683394521 - 2²² = 679200217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (683394511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260605 + ... + 1261146.

It is an arithmetic number, because the mean of its divisors is an integer number (171479136).

Almost surely, 2^683394521 is an apocalyptic number.

It is an amenable number.

683394521 is a deficient number, since it is larger than the sum of its proper divisors (2522023).

683394521 is a wasteful number, since it uses less digits than its factorization.

683394521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522022.

The product of its digits is 155520, while the sum is 41.

The square root of 683394521 is about 26141.8155643406. The cubic root of 683394521 is about 880.8267544483.

The spelling of 683394521 in words is "six hundred eighty-three million, three hundred ninety-four thousand, five hundred twenty-one".