521354321431 has 4 divisors (see below), whose sum is σ = 521829577152. Its totient is φ = 520879065712.

The previous prime is 521354321377. The next prime is 521354321473. The reversal of 521354321431 is 134123453125.

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 521354321431 - 2⁷ = 521354321303 is a prime.

It is a super-2 number, since 2×521354321431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521354321231) 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, 237626215 + ... + 237628408.

It is an arithmetic number, because the mean of its divisors is an integer number (130457394288).

Almost surely, 2^521354321431 is an apocalyptic number.

521354321431 is a deficient number, since it is larger than the sum of its proper divisors (475255721).

521354321431 is a wasteful number, since it uses less digits than its factorization.

521354321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475255720.

The product of its digits is 43200, while the sum is 34.

Adding to 521354321431 its reverse (134123453125), we get a palindrome (655477774556).

The spelling of 521354321431 in words is "five hundred twenty-one billion, three hundred fifty-four million, three hundred twenty-one thousand, four hundred thirty-one".