91898 has 4 divisors (see below), whose sum is σ = 137850. Its totient is φ = 45948.

The previous prime is 91873. The next prime is 91909. The reversal of 91898 is 89819.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 64009 + 27889 = 253^2 + 167^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22973 + ... + 22976.

2⁹¹⁸⁹⁸ is an apocalyptic number.

91898 is a deficient number, since it is larger than the sum of its proper divisors (45952).

91898 is a wasteful number, since it uses less digits than its factorization.

91898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45951.

The product of its digits is 5184, while the sum is 35.

The square root of 91898 is about 303.1468291109. The cubic root of 91898 is about 45.1268846904.

It can be divided in two parts, 91 and 898, that multiplied together give a palindrome (81718).

The spelling of 91898 in words is "ninety-one thousand, eight hundred ninety-eight".