525306421 has 2 divisors, whose sum is σ = 525306422. Its totient is φ = 525306420.

The previous prime is 525306403. The next prime is 525306487. The reversal of 525306421 is 124603525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525051396 + 255025 = 22914^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 525306421 - 2⁵ = 525306389 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 525306421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525306721) 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 as a sum of consecutive naturals, namely, 262653210 + 262653211.

It is an arithmetic number, because the mean of its divisors is an integer number (262653211).

Almost surely, 2^525306421 is an apocalyptic number.

It is an amenable number.

525306421 is a deficient number, since it is larger than the sum of its proper divisors (1).

525306421 is an equidigital number, since it uses as much as digits as its factorization.

525306421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 525306421 is about 22919.5641537966. The cubic root of 525306421 is about 806.8712411918.

Adding to 525306421 its reverse (124603525), we get a palindrome (649909946).

The spelling of 525306421 in words is "five hundred twenty-five million, three hundred six thousand, four hundred twenty-one".