525316521 has 4 divisors (see below), whose sum is σ = 700422032. Its totient is φ = 350211012.

The previous prime is 525316487. The next prime is 525316531. The reversal of 525316521 is 125613525.

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 not a de Polignac number, because 525316521 - 2¹⁷ = 525185449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (525316531) 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, 87552751 + ... + 87552756.

It is an arithmetic number, because the mean of its divisors is an integer number (175105508).

Almost surely, 2^525316521 is an apocalyptic number.

It is an amenable number.

525316521 is a deficient number, since it is larger than the sum of its proper divisors (175105511).

525316521 is a wasteful number, since it uses less digits than its factorization.

525316521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175105510.

The product of its digits is 9000, while the sum is 30.

The square root of 525316521 is about 22919.7844885156. The cubic root of 525316521 is about 806.8764123624.

The spelling of 525316521 in words is "five hundred twenty-five million, three hundred sixteen thousand, five hundred twenty-one".