825671989 has 2 divisors, whose sum is σ = 825671990. Its totient is φ = 825671988.

The previous prime is 825671971. The next prime is 825672013. The reversal of 825671989 is 989176528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752569489 + 73102500 = 27433^2 + 8550^2 .

It is a cyclic number.

It is not a de Polignac number, because 825671989 - 2⁹ = 825671477 is a prime.

It is a super-3 number, since 3×825671989³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825671389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412835994 + 412835995.

It is an arithmetic number, because the mean of its divisors is an integer number (412835995).

Almost surely, 2^825671989 is an apocalyptic number.

It is an amenable number.

825671989 is a deficient number, since it is larger than the sum of its proper divisors (1).

825671989 is an equidigital number, since it uses as much as digits as its factorization.

825671989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The square root of 825671989 is about 28734.5086785906. The cubic root of 825671989 is about 938.1433054070.

The spelling of 825671989 in words is "eight hundred twenty-five million, six hundred seventy-one thousand, nine hundred eighty-nine".