521451213 has 4 divisors (see below), whose sum is σ = 695268288. Its totient is φ = 347634140.

The previous prime is 521451211. The next prime is 521451223. The reversal of 521451213 is 312154125.

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 521451213 - 2¹ = 521451211 is a prime.

It is a super-4 number, since 4×521451213⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521451211) 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, 86908533 + ... + 86908538.

It is an arithmetic number, because the mean of its divisors is an integer number (173817072).

Almost surely, 2^521451213 is an apocalyptic number.

It is an amenable number.

521451213 is a deficient number, since it is larger than the sum of its proper divisors (173817075).

521451213 is a wasteful number, since it uses less digits than its factorization.

521451213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173817074.

The product of its digits is 1200, while the sum is 24.

The square root of 521451213 is about 22835.3062821588. The cubic root of 521451213 is about 804.8925247770.

The spelling of 521451213 in words is "five hundred twenty-one million, four hundred fifty-one thousand, two hundred thirteen".