528723989 has 2 divisors, whose sum is σ = 528723990. Its totient is φ = 528723988.

The previous prime is 528723961. The next prime is 528724051. The reversal of 528723989 is 989327825.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408646225 + 120077764 = 20215^2 + 10958^2 .

It is a cyclic number.

It is not a de Polignac number, because 528723989 - 2¹⁶ = 528658453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 528723989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (528720989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264361994 + 264361995.

It is an arithmetic number, because the mean of its divisors is an integer number (264361995).

Almost surely, 2^528723989 is an apocalyptic number.

It is an amenable number.

528723989 is a deficient number, since it is larger than the sum of its proper divisors (1).

528723989 is an equidigital number, since it uses as much as digits as its factorization.

528723989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 528723989 is about 22993.9989779942. The cubic root of 528723989 is about 808.6172562780.

The spelling of 528723989 in words is "five hundred twenty-eight million, seven hundred twenty-three thousand, nine hundred eighty-nine".