525042321 has 16 divisors (see below), whose sum is σ = 750240384. Its totient is φ = 325759104.

The previous prime is 525042317. The next prime is 525042389. The reversal of 525042321 is 123240525.

It is not a de Polignac number, because 525042321 - 2² = 525042317 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 525042291 and 525042300.

It is not an unprimeable number, because it can be changed into a prime (525042421) 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, 100276 + ... + 105381.

It is an arithmetic number, because the mean of its divisors is an integer number (46890024).

Almost surely, 2^525042321 is an apocalyptic number.

It is an amenable number.

525042321 is a deficient number, since it is larger than the sum of its proper divisors (225198063).

525042321 is a wasteful number, since it uses less digits than its factorization.

525042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205720.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 525042321 is about 22913.8019761017. The cubic root of 525042321 is about 806.7359992278.

Adding to 525042321 its reverse (123240525), we get a palindrome (648282846).

The spelling of 525042321 in words is "five hundred twenty-five million, forty-two thousand, three hundred twenty-one".