521552321 has 8 divisors (see below), whose sum is σ = 530930400. Its totient is φ = 512221248.

The previous prime is 521552293. The next prime is 521552323. The reversal of 521552321 is 123255125.

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-521552321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521552323) 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 7 ways as a sum of consecutive naturals, for example, 11030 + ... + 34128.

It is an arithmetic number, because the mean of its divisors is an integer number (66366300).

Almost surely, 2^521552321 is an apocalyptic number.

It is an amenable number.

521552321 is a deficient number, since it is larger than the sum of its proper divisors (9378079).

521552321 is a wasteful number, since it uses less digits than its factorization.

521552321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23503.

The product of its digits is 3000, while the sum is 26.

The square root of 521552321 is about 22837.5200273585. The cubic root of 521552321 is about 804.9445435866.

The spelling of 521552321 in words is "five hundred twenty-one million, five hundred fifty-two thousand, three hundred twenty-one".