525256521 has 4 divisors (see below), whose sum is σ = 700342032. Its totient is φ = 350171012.

The previous prime is 525256519. The next prime is 525256547. The reversal of 525256521 is 125652525.

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 525256521 - 2¹ = 525256519 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (525256561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87542751 + ... + 87542756.

It is an arithmetic number, because the mean of its divisors is an integer number (175085508).

Almost surely, 2^525256521 is an apocalyptic number.

It is an amenable number.

525256521 is a deficient number, since it is larger than the sum of its proper divisors (175085511).

525256521 is a wasteful number, since it uses less digits than its factorization.

525256521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175085510.

The product of its digits is 30000, while the sum is 33.

The square root of 525256521 is about 22918.4755383075. The cubic root of 525256521 is about 806.8456915645.

The spelling of 525256521 in words is "five hundred twenty-five million, two hundred fifty-six thousand, five hundred twenty-one".