521461321 has 4 divisors (see below), whose sum is σ = 522649600. Its totient is φ = 520273044.

The previous prime is 521461307. The next prime is 521461337. The reversal of 521461321 is 123164125.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 521461321 - 2²¹ = 519364169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521461021) 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, 593481 + ... + 594358.

It is an arithmetic number, because the mean of its divisors is an integer number (130662400).

Almost surely, 2^521461321 is an apocalyptic number.

It is an amenable number.

521461321 is a deficient number, since it is larger than the sum of its proper divisors (1188279).

521461321 is a wasteful number, since it uses less digits than its factorization.

521461321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188278.

The product of its digits is 1440, while the sum is 25.

The square root of 521461321 is about 22835.5276050281. The cubic root of 521461321 is about 804.8977255199.

The spelling of 521461321 in words is "five hundred twenty-one million, four hundred sixty-one thousand, three hundred twenty-one".