825442889 has 2 divisors, whose sum is σ = 825442890. Its totient is φ = 825442888.

The previous prime is 825442843. The next prime is 825442903. The reversal of 825442889 is 988244528.

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., 799023289 + 26419600 = 28267^2 + 5140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825442889 is a prime.

It is not a weakly prime, because it can be changed into another prime (825442819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412721444 + 412721445.

It is an arithmetic number, because the mean of its divisors is an integer number (412721445).

Almost surely, 2^825442889 is an apocalyptic number.

It is an amenable number.

825442889 is a deficient number, since it is larger than the sum of its proper divisors (1).

825442889 is an equidigital number, since it uses as much as digits as its factorization.

825442889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1474560, while the sum is 50.

The square root of 825442889 is about 28730.5219061541. The cubic root of 825442889 is about 938.0565282057.

The spelling of 825442889 in words is "eight hundred twenty-five million, four hundred forty-two thousand, eight hundred eighty-nine".