521525121 has 16 divisors (see below), whose sum is σ = 773015040. Its totient is φ = 310584960.

The previous prime is 521525111. The next prime is 521525149. The reversal of 521525121 is 121525125.

It is not a de Polignac number, because 521525121 - 2¹¹ = 521523073 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 521525091 and 521525100.

It is not an unprimeable number, because it can be changed into a prime (521525111) 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, 214476 + ... + 216893.

It is an arithmetic number, because the mean of its divisors is an integer number (48313440).

Almost surely, 2^521525121 is an apocalyptic number.

It is an amenable number.

521525121 is a deficient number, since it is larger than the sum of its proper divisors (251489919).

521525121 is a wasteful number, since it uses less digits than its factorization.

521525121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431416.

The product of its digits is 1000, while the sum is 24.

The square root of 521525121 is about 22836.9245083483. The cubic root of 521525121 is about 804.9305501856.

The spelling of 521525121 in words is "five hundred twenty-one million, five hundred twenty-five thousand, one hundred twenty-one".