528997491 has 24 divisors (see below), whose sum is σ = 834352896. Its totient is φ = 320304240.

The previous prime is 528997477. The next prime is 528997501. The reversal of 528997491 is 194799825.

It is not a de Polignac number, because 528997491 - 2¹³ = 528989299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (528997421) 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 23 ways as a sum of consecutive naturals, for example, 151026 + ... + 154488.

It is an arithmetic number, because the mean of its divisors is an integer number (34764704).

Almost surely, 2^528997491 is an apocalyptic number.

528997491 is a deficient number, since it is larger than the sum of its proper divisors (305355405).

528997491 is a wasteful number, since it uses less digits than its factorization.

528997491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5020 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 528997491 is about 22999.9454564571. The cubic root of 528997491 is about 808.7566612846.

The spelling of 528997491 in words is "five hundred twenty-eight million, nine hundred ninety-seven thousand, four hundred ninety-one".