528390091 has 4 divisors (see below), whose sum is σ = 531631912. Its totient is φ = 525148272.

The previous prime is 528390077. The next prime is 528390097. The reversal of 528390091 is 190093825.

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 528390091 - 2⁵ = 528390059 is a prime.

It is a super-3 number, since 3×528390091³ (a number of 27 digits) contains 333 as substring.

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 528390091.

It is not an unprimeable number, because it can be changed into a prime (528390097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620666 + ... + 1620991.

It is an arithmetic number, because the mean of its divisors is an integer number (132907978).

Almost surely, 2^528390091 is an apocalyptic number.

528390091 is a deficient number, since it is larger than the sum of its proper divisors (3241821).

528390091 is a wasteful number, since it uses less digits than its factorization.

528390091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241820.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 528390091 is about 22986.7372847910. The cubic root of 528390091 is about 808.4470020144.

The spelling of 528390091 in words is "five hundred twenty-eight million, three hundred ninety thousand, ninety-one".