825606521 has 2 divisors, whose sum is σ = 825606522. Its totient is φ = 825606520.

The previous prime is 825606517. The next prime is 825606541. The reversal of 825606521 is 125606528.

825606521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544708921 + 280897600 = 23339^2 + 16760^2 .

It is a cyclic number.

It is not a de Polignac number, because 825606521 - 2² = 825606517 is a prime.

It is a super-2 number, since 2×825606521² = 1363252255035446882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (825606511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412803260 + 412803261.

It is an arithmetic number, because the mean of its divisors is an integer number (412803261).

Almost surely, 2^825606521 is an apocalyptic number.

It is an amenable number.

825606521 is a deficient number, since it is larger than the sum of its proper divisors (1).

825606521 is an equidigital number, since it uses as much as digits as its factorization.

825606521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 825606521 is about 28733.3694682681. The cubic root of 825606521 is about 938.1185094468.

The spelling of 825606521 in words is "eight hundred twenty-five million, six hundred six thousand, five hundred twenty-one".