828771989 has 2 divisors, whose sum is σ = 828771990. Its totient is φ = 828771988.

The previous prime is 828771967. The next prime is 828772013. The reversal of 828771989 is 989177828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 530519089 + 298252900 = 23033^2 + 17270^2 .

It is a cyclic number.

It is not a de Polignac number, because 828771989 - 2¹⁶ = 828706453 is a prime.

It is a super-2 number, since 2×828771989² = 1373726019502032242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828771689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414385994 + 414385995.

It is an arithmetic number, because the mean of its divisors is an integer number (414385995).

Almost surely, 2^828771989 is an apocalyptic number.

It is an amenable number.

828771989 is a deficient number, since it is larger than the sum of its proper divisors (1).

828771989 is an equidigital number, since it uses as much as digits as its factorization.

828771989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 59.

The square root of 828771989 is about 28788.4002507955. The cubic root of 828771989 is about 939.3159309264.

The spelling of 828771989 in words is "eight hundred twenty-eight million, seven hundred seventy-one thousand, nine hundred eighty-nine".