90198571 has 4 divisors (see below), whose sum is σ = 94120272. Its totient is φ = 86276872.

The previous prime is 90198569. The next prime is 90198587. The reversal of 90198571 is 17589109.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17589109 = 29 ⋅606521.

It is a cyclic number.

It is not a de Polignac number, because 90198571 - 2¹ = 90198569 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90198071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960816 + ... + 1960861.

It is an arithmetic number, because the mean of its divisors is an integer number (23530068).

Almost surely, 2^90198571 is an apocalyptic number.

90198571 is a deficient number, since it is larger than the sum of its proper divisors (3921701).

90198571 is a wasteful number, since it uses less digits than its factorization.

90198571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921700.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 90198571 is about 9497.2928248001. The cubic root of 90198571 is about 448.4698166426.

The spelling of 90198571 in words is "ninety million, one hundred ninety-eight thousand, five hundred seventy-one".