90528191 has 4 divisors (see below), whose sum is σ = 97491912. Its totient is φ = 83564472.

The previous prime is 90528173. The next prime is 90528197. The reversal of 90528191 is 19182509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19182509 = 409 ⋅46901.

It is a cyclic number.

It is not a de Polignac number, because 90528191 - 2²² = 86333887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90528197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481841 + ... + 3481866.

It is an arithmetic number, because the mean of its divisors is an integer number (24372978).

Almost surely, 2^90528191 is an apocalyptic number.

90528191 is a deficient number, since it is larger than the sum of its proper divisors (6963721).

90528191 is a wasteful number, since it uses less digits than its factorization.

90528191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963720.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 90528191 is about 9514.6303659154. The cubic root of 90528191 is about 449.0154458206.

The spelling of 90528191 in words is "ninety million, five hundred twenty-eight thousand, one hundred ninety-one".