521534043031 has 4 divisors (see below), whose sum is σ = 525515219064. Its totient is φ = 517552867000.

The previous prime is 521534042977. The next prime is 521534043083. The reversal of 521534043031 is 130340435125.

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 521534043031 - 2⁷ = 521534042903 is a prime.

It is a super-2 number, since 2×521534043031² (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 = 521534042984 and 521534043002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521534046031) 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, 1990587820 + ... + 1990588081.

It is an arithmetic number, because the mean of its divisors is an integer number (131378804766).

Almost surely, 2^521534043031 is an apocalyptic number.

521534043031 is a deficient number, since it is larger than the sum of its proper divisors (3981176033).

521534043031 is a wasteful number, since it uses less digits than its factorization.

521534043031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981176032.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 521534043031 its reverse (130340435125), we get a palindrome (651874478156).

The spelling of 521534043031 in words is "five hundred twenty-one billion, five hundred thirty-four million, forty-three thousand, thirty-one".