521254543 has 4 divisors (see below), whose sum is σ = 543917808. Its totient is φ = 498591280.

The previous prime is 521254537. The next prime is 521254571. The reversal of 521254543 is 345452125.

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

It is a cyclic number.

It is not a de Polignac number, because 521254543 - 2⁵ = 521254511 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521254343) 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, 11331598 + ... + 11331643.

It is an arithmetic number, because the mean of its divisors is an integer number (135979452).

Almost surely, 2^521254543 is an apocalyptic number.

521254543 is a deficient number, since it is larger than the sum of its proper divisors (22663265).

521254543 is a wasteful number, since it uses less digits than its factorization.

521254543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22663264.

The product of its digits is 24000, while the sum is 31.

The square root of 521254543 is about 22830.9996057991. Note that the first 3 decimals coincide. The cubic root of 521254543 is about 804.7913212420.

The spelling of 521254543 in words is "five hundred twenty-one million, two hundred fifty-four thousand, five hundred forty-three".