528371999 has 4 divisors (see below), whose sum is σ = 538341336. Its totient is φ = 518402664.

The previous prime is 528371993. The next prime is 528372001. The reversal of 528371999 is 999173825.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 528371999 - 2⁸ = 528371743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 9969283 = 528371999 / (5 + 2 + 8 + 3 + 7 + 1 + 9 + 9 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 528371999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528371993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4984589 + ... + 4984694.

It is an arithmetic number, because the mean of its divisors is an integer number (134585334).

Almost surely, 2^528371999 is an apocalyptic number.

528371999 is a deficient number, since it is larger than the sum of its proper divisors (9969337).

528371999 is an equidigital number, since it uses as much as digits as its factorization.

528371999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9969336.

The product of its digits is 1224720, while the sum is 53.

The square root of 528371999 is about 22986.3437501487. The cubic root of 528371999 is about 808.4377748731.

The spelling of 528371999 in words is "five hundred twenty-eight million, three hundred seventy-one thousand, nine hundred ninety-nine".