523121510521 has 4 divisors (see below), whose sum is σ = 523123782912. Its totient is φ = 523119238132.

The previous prime is 523121510473. The next prime is 523121510531. The reversal of 523121510521 is 125015121325.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 523121510521 - 2⁷ = 523121510393 is a prime.

It is a super-2 number, since 2×523121510521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 523121510521.

It is not an unprimeable number, because it can be changed into a prime (523121510531) 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, 746281 + ... + 1266166.

It is an arithmetic number, because the mean of its divisors is an integer number (130780945728).

Almost surely, 2^523121510521 is an apocalyptic number.

It is an amenable number.

523121510521 is a deficient number, since it is larger than the sum of its proper divisors (2272391).

523121510521 is a wasteful number, since it uses less digits than its factorization.

523121510521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272390.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 523121510521 its reverse (125015121325), we get a palindrome (648136631846).

The spelling of 523121510521 in words is "five hundred twenty-three billion, one hundred twenty-one million, five hundred ten thousand, five hundred twenty-one".