825878861 has 2 divisors, whose sum is σ = 825878862. Its totient is φ = 825878860.

The previous prime is 825878821. The next prime is 825878869. The reversal of 825878861 is 168878528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809118025 + 16760836 = 28445^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 825878861 - 2⁶ = 825878797 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 (825878869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412939430 + 412939431.

It is an arithmetic number, because the mean of its divisors is an integer number (412939431).

Almost surely, 2^825878861 is an apocalyptic number.

It is an amenable number.

825878861 is a deficient number, since it is larger than the sum of its proper divisors (1).

825878861 is an equidigital number, since it uses as much as digits as its factorization.

825878861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 53.

The square root of 825878861 is about 28738.1081666835. The cubic root of 825878861 is about 938.2216494218.

The spelling of 825878861 in words is "eight hundred twenty-five million, eight hundred seventy-eight thousand, eight hundred sixty-one".