825984857 has 2 divisors, whose sum is σ = 825984858. Its totient is φ = 825984856.

The previous prime is 825984833. The next prime is 825984871. The reversal of 825984857 is 758489528.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 741418441 + 84566416 = 27229^2 + 9196^2 .

It is a cyclic number.

It is not a de Polignac number, because 825984857 - 2⁶ = 825984793 is a prime.

It is not a weakly prime, because it can be changed into another prime (825984827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412992428 + 412992429.

It is an arithmetic number, because the mean of its divisors is an integer number (412992429).

Almost surely, 2^825984857 is an apocalyptic number.

It is an amenable number.

825984857 is a deficient number, since it is larger than the sum of its proper divisors (1).

825984857 is an equidigital number, since it uses as much as digits as its factorization.

825984857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6451200, while the sum is 56.

The square root of 825984857 is about 28739.9522790140. The cubic root of 825984857 is about 938.2617858520.

The spelling of 825984857 in words is "eight hundred twenty-five million, nine hundred eighty-four thousand, eight hundred fifty-seven".