528389991 has 12 divisors (see below), whose sum is σ = 775742760. Its totient is φ = 346484880.

The previous prime is 528389989. The next prime is 528389993. The reversal of 528389991 is 199983825.

It is an interprime number because it is at equal distance from previous prime (528389989) and next prime (528389993).

It is not a de Polignac number, because 528389991 - 2¹ = 528389989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528389993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480681 + ... + 481778.

It is an arithmetic number, because the mean of its divisors is an integer number (64645230).

Almost surely, 2^528389991 is an apocalyptic number.

528389991 is a deficient number, since it is larger than the sum of its proper divisors (247352769).

528389991 is a wasteful number, since it uses less digits than its factorization.

528389991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962526 (or 962523 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 528389991 is about 22986.7351096236. The cubic root of 528389991 is about 808.4469510137.

The spelling of 528389991 in words is "five hundred twenty-eight million, three hundred eighty-nine thousand, nine hundred ninety-one".