526731521 has 4 divisors (see below), whose sum is σ = 527743044. Its totient is φ = 525720000.

The previous prime is 526731511. The next prime is 526731559. The reversal of 526731521 is 125137625.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 253159921 + 273571600 = 15911^2 + 16540^2 .

It is a cyclic number.

It is not a de Polignac number, because 526731521 - 2¹⁰ = 526730497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (526731511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504980 + ... + 506021.

It is an arithmetic number, because the mean of its divisors is an integer number (131935761).

Almost surely, 2^526731521 is an apocalyptic number.

It is an amenable number.

526731521 is a deficient number, since it is larger than the sum of its proper divisors (1011523).

526731521 is a wasteful number, since it uses less digits than its factorization.

526731521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011522.

The product of its digits is 12600, while the sum is 32.

The square root of 526731521 is about 22950.6322570861. The cubic root of 526731521 is about 807.6002340853.

The spelling of 526731521 in words is "five hundred twenty-six million, seven hundred thirty-one thousand, five hundred twenty-one".