521254820431243 has 8 divisors (see below), whose sum is σ = 522502970310720. Its totient is φ = 520006690100040.

The previous prime is 521254820431187. The next prime is 521254820431273. The reversal of 521254820431243 is 342134028452125.

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-521254820431243 is a prime.

It is a super-3 number, since 3×521254820431243³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521254820431193 and 521254820431202.

It is not an unprimeable number, because it can be changed into a prime (521254820431273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49223188 + ... + 58867918.

It is an arithmetic number, because the mean of its divisors is an integer number (65312871288840).

Almost surely, 2^{521254820431243} is an apocalyptic number.

521254820431243 is a deficient number, since it is larger than the sum of its proper divisors (1248149879477).

521254820431243 is a wasteful number, since it uses less digits than its factorization.

521254820431243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9774137.

The product of its (nonzero) digits is 1843200, while the sum is 46.

Adding to 521254820431243 its reverse (342134028452125), we get a palindrome (863388848883368).

The spelling of 521254820431243 in words is "five hundred twenty-one trillion, two hundred fifty-four billion, eight hundred twenty million, four hundred thirty-one thousand, two hundred forty-three".