825688889 has 2 divisors, whose sum is σ = 825688890. Its totient is φ = 825688888.

The previous prime is 825688883. The next prime is 825688907. The reversal of 825688889 is 988886528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756250000 + 69438889 = 27500^2 + 8333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825688889 is a prime.

It is not a weakly prime, because it can be changed into another prime (825688883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412844444 + 412844445.

It is an arithmetic number, because the mean of its divisors is an integer number (412844445).

Almost surely, 2^825688889 is an apocalyptic number.

It is an amenable number.

825688889 is a deficient number, since it is larger than the sum of its proper divisors (1).

825688889 is an equidigital number, since it uses as much as digits as its factorization.

825688889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17694720, while the sum is 62.

The square root of 825688889 is about 28734.8027485835. The cubic root of 825688889 is about 938.1497060576.

The spelling of 825688889 in words is "eight hundred twenty-five million, six hundred eighty-eight thousand, eight hundred eighty-nine".