825538421 has 2 divisors, whose sum is σ = 825538422. Its totient is φ = 825538420.

The previous prime is 825538369. The next prime is 825538507. The reversal of 825538421 is 124835528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424978225 + 400560196 = 20615^2 + 20014^2 .

It is a cyclic number.

It is not a de Polignac number, because 825538421 - 2²⁶ = 758429557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825538121) 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, 412769210 + 412769211.

It is an arithmetic number, because the mean of its divisors is an integer number (412769211).

Almost surely, 2^825538421 is an apocalyptic number.

It is an amenable number.

825538421 is a deficient number, since it is larger than the sum of its proper divisors (1).

825538421 is an equidigital number, since it uses as much as digits as its factorization.

825538421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76800, while the sum is 38.

The square root of 825538421 is about 28732.1844105178. The cubic root of 825538421 is about 938.0927152274.

The spelling of 825538421 in words is "eight hundred twenty-five million, five hundred thirty-eight thousand, four hundred twenty-one".