521350443431 has 16 divisors (see below), whose sum is σ = 565247257344. Its totient is φ = 478939353984.

The previous prime is 521350443373. The next prime is 521350443443. The reversal of 521350443431 is 134344053125.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521350443431 is a prime.

It is a super-2 number, since 2×521350443431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521350443391 and 521350443400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521350443451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811316 + ... + 1304198.

It is an arithmetic number, because the mean of its divisors is an integer number (35327953584).

Almost surely, 2^521350443431 is an apocalyptic number.

521350443431 is a deficient number, since it is larger than the sum of its proper divisors (43896813913).

521350443431 is a wasteful number, since it uses less digits than its factorization.

521350443431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494390.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 521350443431 its reverse (134344053125), we get a palindrome (655694496556).

The spelling of 521350443431 in words is "five hundred twenty-one billion, three hundred fifty million, four hundred forty-three thousand, four hundred thirty-one".