825721271 has 2 divisors, whose sum is σ = 825721272. Its totient is φ = 825721270.

The previous prime is 825721261. The next prime is 825721277. The reversal of 825721271 is 172127528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825721271 - 2¹⁸ = 825459127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825721277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412860635 + 412860636.

It is an arithmetic number, because the mean of its divisors is an integer number (412860636).

Almost surely, 2^825721271 is an apocalyptic number.

825721271 is a deficient number, since it is larger than the sum of its proper divisors (1).

825721271 is an equidigital number, since it uses as much as digits as its factorization.

825721271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 825721271 is about 28735.3662061231. The cubic root of 825721271 is about 938.1619700661.

Adding to 825721271 its reverse (172127528), we get a palindrome (997848799).

The spelling of 825721271 in words is "eight hundred twenty-five million, seven hundred twenty-one thousand, two hundred seventy-one".