525550321 has 2 divisors, whose sum is σ = 525550322. Its totient is φ = 525550320.

The previous prime is 525550303. The next prime is 525550327. The reversal of 525550321 is 123055525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432640000 + 92910321 = 20800^2 + 9639^2 .

It is a cyclic number.

It is not a de Polignac number, because 525550321 - 2²¹ = 523453169 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 525550321.

It is not a weakly prime, because it can be changed into another prime (525550327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262775160 + 262775161.

It is an arithmetic number, because the mean of its divisors is an integer number (262775161).

Almost surely, 2^525550321 is an apocalyptic number.

It is an amenable number.

525550321 is a deficient number, since it is larger than the sum of its proper divisors (1).

525550321 is an equidigital number, since it uses as much as digits as its factorization.

525550321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 525550321 is about 22924.8843181378. The cubic root of 525550321 is about 806.9960987595.

The spelling of 525550321 in words is "five hundred twenty-five million, five hundred fifty thousand, three hundred twenty-one".