825693989 has 2 divisors, whose sum is σ = 825693990. Its totient is φ = 825693988.

The previous prime is 825693937. The next prime is 825694007. The reversal of 825693989 is 989396528.

825693989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470673025 + 355020964 = 21695^2 + 18842^2 .

It is a cyclic number.

It is not a de Polignac number, because 825693989 - 2²⁰ = 824645413 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 (825693919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412846994 + 412846995.

It is an arithmetic number, because the mean of its divisors is an integer number (412846995).

Almost surely, 2^825693989 is an apocalyptic number.

It is an amenable number.

825693989 is a deficient number, since it is larger than the sum of its proper divisors (1).

825693989 is an equidigital number, since it uses as much as digits as its factorization.

825693989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 59.

The square root of 825693989 is about 28734.8914910079. The cubic root of 825693989 is about 938.1516375977.

The spelling of 825693989 in words is "eight hundred twenty-five million, six hundred ninety-three thousand, nine hundred eighty-nine".