673824521 has 4 divisors (see below), whose sum is σ = 674007444. Its totient is φ = 673641600.

The previous prime is 673824509. The next prime is 673824551. The reversal of 673824521 is 125428376.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 482417296 + 191407225 = 21964^2 + 13835^2 .

It is a cyclic number.

It is not a de Polignac number, because 673824521 - 2¹⁴ = 673808137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673824551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85820 + ... + 93341.

It is an arithmetic number, because the mean of its divisors is an integer number (168501861).

Almost surely, 2^673824521 is an apocalyptic number.

It is an amenable number.

673824521 is a deficient number, since it is larger than the sum of its proper divisors (182923).

673824521 is a wasteful number, since it uses less digits than its factorization.

673824521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182922.

The product of its digits is 80640, while the sum is 38.

The square root of 673824521 is about 25958.1301522278. The cubic root of 673824521 is about 876.6958224162.

The spelling of 673824521 in words is "six hundred seventy-three million, eight hundred twenty-four thousand, five hundred twenty-one".